const byte upButton = 5;
const byte downButton = 4;
const byte stopButton = 3;
const byte a = 6;
const byte b = 7;
const byte c = 8;
const byte d = 9;
const byte e = 10;
const byte f = 12;
const byte g = 11;
byte s1State, s2State, s3State;

void setup() {
  for (int counter=6; counter<=12; counter++){
    pinMode(counter, OUTPUT);
  }
  pinMode(upButton, INPUT);
  pinMode(downButton, INPUT);
  pinMode(stopButton, INPUT);
}

void off(){
  digitalWrite(a,HIGH);
  digitalWrite(b,HIGH);
  digitalWrite(c,HIGH);
  digitalWrite(d,HIGH);
  digitalWrite(e,HIGH);
  digitalWrite(f,HIGH);
  digitalWrite(g,HIGH);
}

void zero(){
  digitalWrite(a,LOW);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,LOW);
  digitalWrite(e,LOW);
  digitalWrite(f,LOW);
  digitalWrite(g,HIGH);
}

void one(){
  digitalWrite(a,HIGH);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,HIGH);
  digitalWrite(e,HIGH);
  digitalWrite(f,HIGH);
  digitalWrite(g,HIGH);
}

void two(){
  digitalWrite(a,LOW);
  digitalWrite(b,LOW);
  digitalWrite(c,HIGH);
  digitalWrite(d,LOW);
  digitalWrite(e,LOW);
  digitalWrite(f,HIGH);
  digitalWrite(g,LOW);
}

void three(){
  digitalWrite(a,LOW);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,LOW);
  digitalWrite(e,HIGH);
  digitalWrite(f,HIGH);
  digitalWrite(g,LOW);
}

void four(){
  digitalWrite(a,HIGH);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,HIGH);
  digitalWrite(e,HIGH);
  digitalWrite(f,LOW);
  digitalWrite(g,LOW);
}

void five(){
  digitalWrite(a,LOW);
  digitalWrite(b,HIGH);
  digitalWrite(c,LOW);
  digitalWrite(d,LOW);
  digitalWrite(e,HIGH);
  digitalWrite(f,LOW);
  digitalWrite(g,LOW);
}

void six(){
  digitalWrite(a,LOW);
  digitalWrite(b,HIGH);
  digitalWrite(c,LOW);
  digitalWrite(d,LOW);
  digitalWrite(e,LOW);
  digitalWrite(f,LOW);
  digitalWrite(g,LOW);
}

void seven(){
  digitalWrite(a,LOW);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,HIGH);
  digitalWrite(e,HIGH);
  digitalWrite(f,HIGH);
  digitalWrite(g,HIGH);
}

void eight(){
  digitalWrite(a,LOW);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,LOW);
  digitalWrite(e,LOW);
  digitalWrite(f,LOW);
  digitalWrite(g,LOW);
}

void nine(){
  digitalWrite(a,LOW);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,LOW);
  digitalWrite(e,HIGH);
  digitalWrite(f,LOW);
  digitalWrite(g,LOW);
}

void loop() {
  off();
  
  main:
  s1State=digitalRead(upButton);
  s2State=digitalRead(downButton);

  if(s1State==0){
    goto a;
  }else if(s2State == 0){
    goto b;
  }
  goto main;

  a:
  s2State=digitalRead(downButton);
  s3State=digitalRead(stopButton);

  while (s1State==0){
    zero();
    for(int counter=0; counter<=500;counter++){
      s2State=digitalRead(downButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s2State==1){
        off();
        goto main;
      }else if(s3State==1 && s2State==0){
        goto b;
      }
      delay(1);
    }
    one();
    for(int counter=0; counter<=500;counter++){
      s2State=digitalRead(downButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s2State==1){
        off();
        goto main;
      }else if(s3State==1 && s2State==0){
        goto b;
      }
      delay(1);
    }
    two();
    for(int counter=0; counter<=500;counter++){
      s2State=digitalRead(downButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s2State==1){
        off();
        goto main;
      }else if(s3State==1 && s2State==0){
        goto b;
      }
      delay(1);
    }
    three();
    for(int counter=0; counter<=500;counter++){
      s2State=digitalRead(downButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s2State==1){
        off();
        goto main;
      }else if(s3State==1 && s2State==0){
        goto b;
      }
      delay(1);
    }
    four();
    for(int counter=0; counter<=500;counter++){
      s2State=digitalRead(downButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s2State==1){
        off();
        goto main;
      }else if(s3State==1 && s2State==0){
        goto b;
      }
      delay(1);
    }
    five();
    for(int counter=0; counter<=500;counter++){
      s2State=digitalRead(downButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s2State==1){
        off();
        goto main;
      }else if(s3State==1 && s2State==0){
        goto b;
      }
      delay(1);
    }
    six();
    for(int counter=0; counter<=500;counter++){
      s2State=digitalRead(downButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s2State==1){
        off();
        goto main;
      }else if(s3State==1 && s2State==0){
        goto b;
      }
      delay(1);
    }
    seven();
    for(int counter=0; counter<=500;counter++){
      s2State=digitalRead(downButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s2State==1){
        off();
        goto main;
      }else if(s3State==1 && s2State==0){
        goto b;
      }
      delay(1);
    }
    eight();
    for(int counter=0; counter<=500;counter++){
      s2State=digitalRead(downButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s2State==1){
        off();
        goto main;
      }else if(s3State==1 && s2State==0){
        goto b;
      }
      delay(1);
    }
    nine();
    for(int counter=0; counter<=500;counter++){
      s2State=digitalRead(downButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s2State==1){
        off();
        goto main;
      }else if(s3State==1 && s2State==0){
        goto b;
      }
      delay(1);
    }
  }

  b:
  s1State=digitalRead(upButton);
  s3State=digitalRead(stopButton);
  while(s3State == 0){
    off();
    goto main;
  }
  while (s2State==0){
    nine();
    for(int counter=0; counter<=500;counter++){
      s1State=digitalRead(upButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s1State==1){
        off();
        goto main;
      }else if(s3State==1 && s1State==0){
        goto a;
      }
      delay(1);
    }
    eight();
    for(int counter=0; counter<=500;counter++){
      s1State=digitalRead(upButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s1State==1){
        off();
        goto main;
      }else if(s3State==1 && s1State==0){
        goto a;
      }
      delay(1);
    }
    seven();
    for(int counter=0; counter<=500;counter++){
      s1State=digitalRead(upButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s1State==1){
        off();
        goto main;
      }else if(s3State==1 && s1State==0){
        goto a;
      }
      delay(1);
    }
    six();
    for(int counter=0; counter<=500;counter++){
      s1State=digitalRead(upButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s1State==1){
        off();
        goto main;
      }else if(s3State==1 && s1State==0){
        goto a;
      }
      delay(1);
    }
    five();
    for(int counter=0; counter<=500;counter++){
      s1State=digitalRead(upButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s1State==1){
        off();
        goto main;
      }else if(s3State==1 && s1State==0){
        goto a;
      }
      delay(1);
    }
    four();
    for(int counter=0; counter<=500;counter++){
      s1State=digitalRead(upButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s1State==1){
        off();
        goto main;
      }else if(s3State==1 && s1State==0){
        goto a;
      }
      delay(1);
    }
    three();
    for(int counter=0; counter<=500;counter++){
      s1State=digitalRead(upButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s1State==1){
        off();
        goto main;
      }else if(s3State==1 && s1State==0){
        goto a;
      }
      delay(1);
    }
    two();
    for(int counter=0; counter<=500;counter++){
      s1State=digitalRead(upButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s1State==1){
        off();
        goto main;
      }else if(s3State==1 && s1State==0){
        goto a;
      }
      delay(1);
    }
    one();
    for(int counter=0; counter<=500;counter++){
      s1State=digitalRead(upButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s1State==1){
        off();
        goto main;
      }else if(s3State==1 && s1State==0){
        goto a;
      }
      delay(1);
    }
    zero();
    for(int counter=0; counter<=500;counter++){
      s1State=digitalRead(upButton);
      s3State=digitalRead(stopButton);
      if(s3State==0 && s1State==1){
        off();
        goto main;
      }else if(s3State==1 && s1State==0){
        goto a;
      }
      delay(1);
    }
  }
}