const int ledPin1 = 5;  // Pin for the first LED
const int ledPin2 = 2;  // Pin for the second LED
const int ledPin3 = 15;  // Pin for the third LED

void setup() {
  // Set up all pins as digital output pins
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
}

void loop() {
  // Turn on the first LED
  digitalWrite(ledPin1, HIGH);
  digitalWrite(ledPin2, LOW);
  digitalWrite(ledPin3, LOW);
  delay(500);  // Wait for half a second

  // Turn on the second LED
  digitalWrite(ledPin1, LOW);
  digitalWrite(ledPin2, HIGH);
  digitalWrite(ledPin3, LOW);
  delay(500);  // Wait for half a second

  // Turn on the third LED
  digitalWrite(ledPin1, LOW);
  digitalWrite(ledPin2, LOW);
  digitalWrite(ledPin3, HIGH);
  delay(500);  // Wait for half a second
}