void setup() {
  // put your setup code here, to run once:
pinMode(2,OUTPUT);
pinMode(4,INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
int i=digitalRead(4);
if(i==1)
{
  digitalWrite(2,0);
delay(1000);
}
else
{
  digitalWrite(2,1);
  delay(1000);
}
}