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(13,1);
digitalWrite(12,0);
digitalWrite(11,0);
delay(5000);
digitalWrite(13,0);
digitalWrite(12,1);
digitalWrite(11,0);
delay(5000);
digitalWrite(13,0);
digitalWrite(12,0);
digitalWrite(11,1);delay(5000);
}