// 5 задание
void setup() {
  pinMode(2, INPUT_PULLUP);
  pinMode(13, OUTPUT);
}
bool ledEnable = false;
bool lastButtonState = HIGH;
bool buttonState;
unsigned long lastDebounceTime = 0;
const int DEBOUNCE_DELAY = 50;
void loop() {
  bool buttonIsUp = digitalRead(2);
  if (buttonIsUp != lastButtonState) {
    lastDebounceTime = millis();
  }
  if ((millis() - lastDebounceTime) > 50) {
    if (buttonIsUp != buttonState) {
      buttonState = buttonIsUp;
      if (!buttonState) {
        for (int i = 0; i < 3; i++) {
          digitalWrite(13, HIGH);
          delay(500);
          digitalWrite(13, LOW);
          delay(500);
        }
        ledEnable = !ledEnable;
        digitalWrite(13, ledEnable);
      }
    }
  }
  lastButtonState = buttonIsUp;
}