const int buttonPin = 7;
const int ledPin1 = 8;
const int ledPin2 = 9;
const int ledPin3 = 10;

int buttonState = 0;
int lastButtonState = 0;
int ledState1 = LOW;
int ledState2 = LOW;
int ledState3 = LOW;

void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  digitalWrite(ledPin1, ledState1);
  digitalWrite(ledPin2, ledState2);
  digitalWrite(ledPin3, ledState3);
}

void loop() {
  buttonState = digitalRead(buttonPin);

  if (buttonState == HIGH && lastButtonState == LOW) {
    ledState1 = (ledState1 == LOW) ? HIGH : LOW;
    ledState2 = (ledState2 == LOW) ? HIGH : LOW;
    ledState3 = (ledState3 == LOW) ? HIGH : LOW;

    digitalWrite(ledPin1, ledState1);
    digitalWrite(ledPin2, ledState2);
    digitalWrite(ledPin3, ledState3);
  }

  lastButtonState = buttonState;
}