void setup() {
  pinMode(4, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(0, INPUT_PULLUP);
  pinMode(1, INPUT_PULLUP);
  pinMode(2, INPUT_PULLUP);
  digitalWrite(3, HIGH);
}
bool a = false;
void loop() {
  if(a==true|| digitalRead(0) == LOW && digitalRead(1) == LOW ){
    if(!a){
      digitalWrite(4, LOW);
      delay(200);
      digitalWrite(4, HIGH);
      delay(1000);
      pinMode(0, OUTPUT);
      pinMode(1, OUTPUT);
      pinMode(2, OUTPUT);
    }
    

    delay(200);
    digitalWrite(0, HIGH);
    digitalWrite(1, HIGH);
    digitalWrite(2, HIGH);
    delay(200);
    digitalWrite(0, LOW);
    digitalWrite(1, LOW);
    digitalWrite(2, LOW);
    a = true;
    return;
  } 
  if(digitalRead(0) == LOW || digitalRead(1) == LOW || digitalRead(2) == LOW){
    digitalWrite(4, HIGH);
  }else{
    digitalWrite(4, LOW);
  }
  
}