void setup() {
  // put your setup code here, to run once: 
  pinMode(1, OUTPUT);
  pinMode(3, OUTPUT);

  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);

  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);

  pinMode(11, OUTPUT);
  pinMode(13, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(1, HIGH);
  delay(500);

  digitalWrite(3, LOW);
  delay(500);

  digitalWrite(4, HIGH);
  delay(500);

  digitalWrite(5, LOW);
  delay(500);

  digitalWrite(8, HIGH);
  delay(500);

  digitalWrite(9, LOW);
  delay(500);

  digitalWrite(11, HIGH);
  delay(500);

  digitalWrite(13, LOW);
  delay(500);
}