void setup() {
  pinMode(3, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
}

void loop() {
digitalWrite(3, HIGH);
delay(1000);
digitalWrite(3, LOW);

digitalWrite(3, HIGH);
digitalWrite(5, HIGH);
delay(1000);
digitalWrite(3, LOW);
digitalWrite(5, LOW);

digitalWrite(5, HIGH);
delay(1000);
digitalWrite(5, LOW);
}