void setup() {
  // put your setup code here, to run once:
 pinMode(13, OUTPUT);
 pinMode(12, OUTPUT);
 pinMode(11, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
 digitalWrite(13, HIGH);
 digitalWrite(12, LOW);
 digitalWrite(11, LOW);
 delay(3000);
 digitalWrite(12, HIGH);
 digitalWrite(13, LOW);
 digitalWrite(11, LOW);
 delay(500);
 digitalWrite(11, HIGH);
 digitalWrite(12, LOW);
 digitalWrite(13, LOW);
 delay(1000);
}