const int buttonPin = 2;  
const int ledPin = 7;    
int buttonState = 0;      
int count = 1;            
void setup() {
  pinMode(buttonPin, INPUT);   
  pinMode(ledPin, OUTPUT);     
}

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

  if (buttonState == HIGH) {  
    delay(50);  
    if (buttonState == HIGH) { 
      count++;  
      delay(500);  
    }
  }

  
  if (count >= 4) {
    for (int i = 0; i < 4; i++) {
      digitalWrite(ledPin, HIGH);  
      delay(500);  
      digitalWrite(ledPin, LOW);   
      delay(500);  
      
    }
    count = 0;  
  }
}