int pin = 4;
int led = 7;

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

void loop() {
  // put your main code here, to run repeatedly:
  // if(digitalRead(pin))
  // {
  //   digitalWrite(led, HIGH);
  //   delay(100);
  //   }
  // else
  // {
  //   digitalWrite(led, LOW);
  //   delay(100);
  // }

}