void setup() {
  // put your setup code here, to run once:
 pinMode(2, INPUT);
 pinMode(3, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  // this speeds up the simulation
  int x = digitalRead(2);
  if(x==0){
    digitalWrite(3, HIGH);
  }
  else digitalWrite(3,LOW);
}