const int ledPin1 = 13;
const int ledPin2 = 12;
const int ledPin3 = 11;
const int ledPin4 = 10;
const int blinkCount = 3;
const int blinkDelay = 300;

void setup() {
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  pinMode(ledPin4, OUTPUT);
}

void loop() {
  for (int j = 0; j < blinkCount; j++) {
    // LED 1
    digitalWrite(ledPin1, HIGH);
    delay(blinkDelay);
    digitalWrite(ledPin1, LOW);
    delay(blinkDelay);

    // LED 2
    digitalWrite(ledPin2, HIGH);
    delay(blinkDelay);
    digitalWrite(ledPin2, LOW);
    delay(blinkDelay);

    // LED 3
    digitalWrite(ledPin3, HIGH);
    delay(blinkDelay);
    digitalWrite(ledPin3, LOW);
    delay(blinkDelay);

    // LED 4
    digitalWrite(ledPin4, HIGH);
    delay(blinkDelay);
    digitalWrite(ledPin4, LOW);
    delay(blinkDelay);
  }
  if (blinkCount % 2 == 0) {
    delay(2000);
  } else {
    delay(6000);
  }
}