void setup() {
  pinMode(13, OUTPUT);
  pinMode(2, INPUT_PULLUP);
}

boolean buttonWasUp = true;

void loop() {
  boolean buttonIsUp = digitalRead(2);
  if (buttonWasUp != buttonIsUp) {
    delay(20);
    buttonIsUp = digitalRead(2);
    if (!buttonIsUp) {
      digitalWrite(13, HIGH);
      delay(500);
      digitalWrite(13, LOW);
      delay(500);
      digitalWrite(13, HIGH);
      delay(500);
      digitalWrite(13, LOW);
      delay(500);
      digitalWrite(13, HIGH);
      delay(500);
      digitalWrite(13, LOW);
      delay(500);
      digitalWrite(13, HIGH);
      delay(5000);
    } else {
      digitalWrite(13, LOW);
  }
  buttonWasUp = buttonIsUp;
  }
}