void setup() {
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
}

void loop() {
  for (int i = 0; i < 5; i++) {
  digitalWrite(13, HIGH);
  delay(500);
  digitalWrite(13, LOW);
  delay(500);
  }

  for(int i = 0; i < 10; i++) {
  digitalWrite(12, HIGH);
  delay(500);
  digitalWrite(12, LOW);
  delay(500);
  }

  for(int i=0; i<15; i++){
      digitalWrite(11, HIGH);
  delay(500);
  digitalWrite(11, LOW);
  delay(500);
  }

}