int d = 200;

void setup() {
  // put your setup code here, to run once:
  for (int pins = 0; pins <= 13; pins++) {
    pinMode(pins, OUTPUT);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  for (int pins = 11; pins <= 13; pins++) {
    digitalWrite(pins, HIGH);
    delay(d);
    digitalWrite(pins, LOW);
  }
}