// Define pin numbers for the LEDs
const int redLED = 2;
const int yellowLED = 3;
const int greenLED = 4;

void setup() {
  // Set LED pins as OUTPUT
  pinMode(redLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
}

void loop() {
  // Red LED ON
  digitalWrite(redLED, HIGH);
  delay(5000); // Wait for 5 seconds
  digitalWrite(redLED, LOW);

  // Yellow LED ON
  digitalWrite(yellowLED, HIGH);
  delay(2000); // Wait for 2 seconds
  digitalWrite(yellowLED, LOW);

  // Green LED ON
  digitalWrite(greenLED, HIGH);
  delay(5000); // Wait for 5 seconds
  digitalWrite(greenLED, LOW);
}