// Define the pins for the LEDs
int led1 = 2;
int led2 = 3;
int led3 = 4;

void setup() {
  // Initialize the LED pins as OUTPUT
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
}

void loop() {
  // Task 1: LED1 on and off for 1 time
  for(int i = 0; i < 1; i++) {
    digitalWrite(led1, HIGH); // Turn LED1 on
    delay(500);               // Wait for half a second
    digitalWrite(led1, LOW);  // Turn LED1 off
    delay(500);               // Wait for half a second
  }

  // Task 2: LED2 on and off for 2 times
  for(int i = 0; i < 2; i++) {
    digitalWrite(led2, HIGH); // Turn LED2 on
    delay(500);               // Wait for half a second
    digitalWrite(led2, LOW);  // Turn LED2 off
    delay(500);               // Wait for half a second
  }

  // Task 3: LED3 on and off for 3 times
  for(int i = 0; i < 3; i++) {
    digitalWrite(led3, HIGH); // Turn LED3 on
    delay(500);               // Wait for half a second
    digitalWrite(led3, LOW);  // Turn LED3 off
    delay(500);               // Wait for half a second
  }

  // Optional delay before restarting the sequence
  delay(2000);
}