#define LED_BUILTIN 2
const int button = 4;

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

void loop() {
  // put your main code here, to run repeatedly:
  if(button == 1 ){
    digitalWrite(LED_BUILTIN, HIGH);
  }
  
}