void setup() {
  // put your setup code here, to run once:
  pinMode(3, OUTPUT);
  pinMode(5, INPUT);
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:
  int r;
  r = digitalRead(5);
  Serial.println(r);
  if(r == LOW){
    digitalWrite(3, HIGH);
  }
  else{
    digitalWrite(3, LOW);
  }
}