int LED=13;
int button=2;
void setup() {
  // put your setup code here, to run once:
  pinMode(LED, OUTPUT);
  pinMode(button, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
int val=digitalRead(button);
if(val==HIGH){
  digitalWrite(LED, LOW);
}else{
  digitalWrite(LED, HIGH);
}
}