const int ledPin = 13;  // LED connected to digital pin 13

void setup() {
  pinMode(ledPin, OUTPUT);  // Set ledPin as OUTPUT
}

void loop() {
  for (int i = 0; i < 4; i++) {  // Blink LED 4 times
    digitalWrite(ledPin, HIGH);  // Turn LED ON
    delay(500);                 // Wait for 500 milliseconds
    digitalWrite(ledPin, LOW);   // Turn LED OFF
    delay(500);                 // Wait for 500 milliseconds
  }
  while (true);                 // Stop the loop after 4 blinks
}