#define LED_PIN 12
#define LED_PIN2 14
#define LED_PIN3 27
#define LED_PIN4 26

int speed = 500;

void setup() {
  pinMode(LED_PIN,  OUTPUT);
  pinMode(LED_PIN2, OUTPUT);
  pinMode(LED_PIN3, OUTPUT);
  pinMode(LED_PIN4, OUTPUT);
}
void loop() {
  digitalWrite(LED_PIN, HIGH);
  delay(speed);
  digitalWrite(LED_PIN, LOW);
  delay(speed);
  digitalWrite(LED_PIN2, HIGH);
  delay(speed);
  digitalWrite(LED_PIN2, LOW);
  delay(speed);
  digitalWrite(LED_PIN3, HIGH);
  delay(speed);
  digitalWrite(LED_PIN3, LOW);
  delay(speed);
  digitalWrite(LED_PIN4, HIGH);
  delay(speed);
  digitalWrite(LED_PIN4, LOW);
  delay(speed);
}