const int buttonpin = 8;
const int ledpin = 4;

int buttonState = 0;
int lastButtonstate = 0;
int buttonPressCount = 0;

void setup(){
  pinMode(buttonpin, INPUT);
  pinMode(ledpin, OUTPUT);

}

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

  if (buttonState == HIGH && lastButtonstate == LOW) {
    buttonPressCount++;

    digitalWrite(ledpin , !digitalRead(ledpin));
    delay(1000);
  }
  lastButtonstate = buttonState;

  if(buttonPressCount >=4) {
    while (true){
      digitalWrite(ledpin, LOW);
    }
  }
}