---

#define BUTTON 2
#define LED 4

int count = 0;

void setup() {
  pinMode(BUTTON, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
}

void loop() {

  if (digitalRead(BUTTON) == LOW) {
    count++;

    if (count == 3) {
      digitalWrite(LED, HIGH);
      count = 0;
    }

    delay(300);
  }
}