void setup() {
  // put your setup code here, to run once:
pinMode(10, OUTPUT);
pinMode(8, OUTPUT);
pinMode(6, OUTPUT);
pinMode(3, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(10, HIGH);
delay(5000);
digitalWrite(10, LOW);
digitalWrite(8, HIGH);
delay(5000);
digitalWrite(8, LOW);
digitalWrite(6, HIGH);
delay(5000);
digitalWrite(6, LOW);
digitalWrite(3, HIGH);
delay(5000);
digitalWrite(3, LOW);
delay(500);

}