int LED = 13;
int btn = 5;

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

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(btn) == HIGH){
    digitalWrite(LED, HIGH);
    delay(200);
    digitalWrite(LED, LOW);
  }
}