const int buttonPin = 2; 
const int ledPin1 = 13;  
const int ledPin2 = 8;   
const int ledPin3 = 4;   

bool buttonState = false;

void setup() {
  // Set all LED pins as outputs
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  
  // Set button pin as input with internal pull-up resistor
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
  // Read the state of the button
  buttonState = digitalRead(buttonPin);

  // Check if the button is pressed 
  // (LOW means pressed when using INPUT_PULLUP connected to GND)
  if (buttonState == LOW) {
    digitalWrite(ledPin1, HIGH); // Turn LEDs on
    digitalWrite(ledPin2, HIGH);
    digitalWrite(ledPin3, HIGH);
  } else {
    digitalWrite(ledPin1, LOW);  // Turn LEDs off
    digitalWrite(ledPin2, LOW);
    digitalWrite(ledPin3, LOW);
  }
}