int c = 0;

void setup()
{
  pinMode(13, OUTPUT);
  pinMode(2, INPUT_PULLUP);
  Serial.begin(9600);
  digitalWrite(13, HIGH);
}

void loop()
{
  if (digitalRead(2) == LOW)
  {
    c++;

    digitalWrite(13, LOW);
    Serial.print("OFF: ");
    Serial.println(c);

    delay(1000);
    digitalWrite(13, HIGH);

    while (digitalRead(2) == LOW);
  }
}