void setup() {
  pinMode(5, OUTPUT);
  pinMode(18, OUTPUT);
  pinMode(19, OUTPUT);
  pinMode(15, INPUT);
}

void loop() {
  if(digitalRead(15) == HIGH){
    digitalWrite(18, HIGH);
    delay(3000);
    digitalWrite(18, LOW);
    digitalWrite(19, HIGH);
    delay(5000);
    digitalWrite(18, HIGH);
    delay(2000);
    digitalWrite(19, LOW);
    digitalWrite(18, LOW);
    digitalWrite(5, HIGH);
    delay(3000);
    digitalWrite(5, LOW);
    digitalWrite(18, LOW);
    digitalWrite(19, LOW);
  } else {
    digitalWrite(5, LOW);
    digitalWrite(18, LOW);
    digitalWrite(19, LOW);
  }
}