void setup() {
  // put your setup code here, to run once:
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(7, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
int button;
button = digitalRead(7);

if(button == LOW){
digitalWrite(3, HIGH);
digitalWrite(2, LOW);
digitalWrite(1, LOW);
}
  else{
    digitalWrite(7, LOW);
    digitalWrite(3, HIGH);
    delay(500);
    digitalWrite(2, LOW);
    delay(500);
    digitalWrite(1, HIGH);
    delay(3000);
    digitalWrite(1,LOW);
    delay(500);
    digitalWrite(3, LOW);
    delay(500);
    digitalWrite(3, HIGH);
    delay(500);
    
  }


}