void setup() {
  // put your setup code here, to run once:
  pinMode(6,OUTPUT);
  pinMode(5,OUTPUT);
  pinMode(4,OUTPUT);
}

void loop() {
tone(9,10);
digitalWrite(6,1);
delay(30000);
digitalWrite(6,0);
delay(1000);
digitalWrite(5,1);
delay(10000);
digitalWrite(5,0);
delay(1000);
digitalWrite(4,1);
delay(20000);
digitalWrite(4,0);
delay(1000);

      }