byte upButton = 5;
byte downButton = 4;
byte stopButton = 3;
byte a = 6;
byte b = 7;
byte c = 8;
byte d = 9;
byte e = 10;
byte f = 12;
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){
    condition = 0;
    goto a;
  }else if(s2State == 0){
    condition = 9;
    goto b;
  }
  goto main;

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

  if(s3State==0){
    off();
    condition = 0;
    goto main;
  }

  if(condition==0){
    zero();
    for(int counter=0; counter<500; counter++){
      s2State = digitalRead(downButton);
      s3State = digitalRead(stopButton);
      if(s2State==1 && s3State==0){
        off();
        condition=0;
        goto main;
      }else if(s2State==0 && s3State==1){
        condition=9;
        goto b;
      }
      delay(1);
    }
    condition=1;

  } else if(condition==1){
    one();
    for(int counter=0; counter<500; counter++){
      s2State = digitalRead(downButton);
      s3State = digitalRead(stopButton);
      if(s2State==1 && s3State == 0){
        off();
        condition=0;
        goto main;
      }else if(condition)
    }
  }

}