int ledPin = 13;                // choose the pin for the LED
int inputPin = 2;               // choose the input pin  
int val = 0;                    // variable for reading the pin status

void setup() {
	pinMode(ledPin, OUTPUT);      // declare LED as output
	pinMode(inputPin, INPUT);     // declare pushbutton as input
}

void loop(){
	val = digitalRead(inputPin);  // read input value

	if (val == HIGH) {            // check if the input is HIGH
    	digitalWrite(ledPin, LOW);  // turn LED OFF
  	} else {
    	digitalWrite(ledPin, HIGH); // turn LED ON
  	}
}