const int button1=4;
const int button2=5;
const int button3=6;
const int led1=3;
const int led2=2;
const int led3=7;

void setup() {
  // put your setup code here, to run once:
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  
  pinMode(button1, INPUT_PULLUP);
  pinMode(button2, INPUT_PULLUP);
  pinMode(button3, INPUT_PULLUP);
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:
int button1State=digitalRead(button1);
int button2State=digitalRead(button2);
int button3State=digitalRead(button3);

while(button2State==HIGH && button3State==HIGH && button1State==LOW){

if(button2State==LOW || button3State==LOW){ 
break;}

  digitalWrite(led1, HIGH);
  delayMicroseconds(1000000);
  digitalWrite(led1, LOW);
  delay(100);
  digitalWrite(led2, HIGH);
  delayMicroseconds(1000000);
  digitalWrite(led2, LOW);
  delay(100);
  digitalWrite(led3, HIGH);
  delayMicroseconds(1000000);
  digitalWrite(led3, LOW);
  delay(100);

}

while(button2State==LOW && button3State==HIGH && button1State==HIGH){
  if(button1State==LOW || button3State==LOW){
    break;
  }
  digitalWrite(led2, HIGH);
  delay(100);
  digitalWrite(led2, LOW);
  delay(100);

  digitalWrite(led3, HIGH);
  delay(100);
  digitalWrite(led3, LOW);
  delay(100);

  digitalWrite(led1, HIGH);
  delay(100);
  digitalWrite(led1, LOW);
  delay(100);
}

while(button3State==LOW && button2State==HIGH && button1State==HIGH){

  
  digitalWrite(led3, HIGH);
  delay(1000);
  digitalWrite(led3, LOW);
  delayMicroseconds(100);

  digitalWrite(led2, HIGH);
  delay(1000);
  digitalWrite(led2, LOW);
  delayMicroseconds(100);

  digitalWrite(led1, HIGH);
  delay(1000);
  digitalWrite(led1, LOW);
  delayMicroseconds(100);
}
}