const int ledPin1 = 5;  // First LED pin
const int ledPin2 = 17; // Second LED pin
const int ledPin3 = 16; // Third LED pin

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

void loop() {
  // Turn on the first LED
  digitalWrite(ledPin1, HIGH);
  delay(500);
  digitalWrite(ledPin1, LOW);
  delay(500);

  // Turn on the second LED
  digitalWrite(ledPin2, HIGH);
  delay(500);
  digitalWrite(ledPin2, LOW);
  delay(500);

  // Turn on the third LED
  digitalWrite(ledPin3, HIGH);
  delay(500);
  digitalWrite(ledPin3, LOW);
  delay(500);
}