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

void loop() {
  if(digitalRead(15) == HIGH);{
    digitalWrite (5,HIGH);
    delay (1000);
    digitalWrite (18,HIGH);
    delay (1000);
    digitalWrite (19,HIGH);
    delay (1000);
  }
  else{
    digitalWrite(5,LOW);
    digitalWrite(18,LOW);
    digitalWrite (19,LOW);
  }
}