int led = 13;
int button = 4;
void setup(){
  pinMode(4,INPUT);
  pinMode(13, OUTPUT);
}
void loop(){
  int sbutton= digitalRead(4);
  if(sbutton==1){
    digitalWrite(13 , HIGH);
    delay(2000);
  }
  else{
     digitalWrite(13 , LOW);
    delay(2000);
  }
}