int LED1 = 6;
int LED2 = 7;
int LED3 = 8;
int btn = 11;
int btn = 12;
int btn = 13;

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


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