int cny=5;
unsigned long cnyon;
int led=13;

void setup (){
  pinMode (cny, INPUT);
  pinMode (led, OUTPUT);
  Serial.begin (9600);
}

void loop () {
  cnyon= digitalRead (cny);
  Serial.println (cnyon);
  if (cnyon != 0){
    digitalWrite (led,HIGH);
  }
  else {
    digitalWrite (led, LOW);
  }
}