const int ledPin = 21;       
const int buttonPin = 5;     


int buttonPressCount = 0;
bool lastButtonState = LOW;  
bool currentButtonState = LOW;
unsigned long lastDebounceTime = 0;  
unsigned long debounceDelay = 50;  
  
void setup() {
  pinMode(ledPin, OUTPUT);       
  pinMode(buttonPin, INPUT);     
  digitalWrite(ledPin, LOW);     
}
void loop() {
  int reading = digitalRead(buttonPin);
  if (reading != lastButtonState) {
    lastDebounceTime = millis();  
  }
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading == HIGH && currentButtonState == LOW) {
      buttonPressCount++;  
      if (buttonPressCount == 5) {
        digitalWrite(ledPin, HIGH);  
      }
      if (buttonPressCount > 5) {
              }
    }
    currentButtonState = reading;  
  }
  lastButtonState = reading;  
}