void setup() {
  pinMode(33, OUTPUT);
  pinMode(26, OUTPUT);
  pinMode(27, OUTPUT);
}

void loop() {
  for (int angka = 1; angka <= 3; angka++){
    if (angka == 1){
      berkedip (33, 500);
    } else if (angka == 2){
      berkedip (26, 500);
    } else {
      berkedip (27,500);
    }
  }
}

void berkedip(int led, int jeda){
  digitalWrite(led, HIGH);
  delay(jeda);
  digitalWrite(led, LOW);
  delay(jeda);
}