int led1 = 16;
int led2 = 17;
int but1 = 13;

void setup() {
  pinMode(13, INPUT);
}

void loop() {

  if (digitalRead(but1) == HIGH) {
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
  }
  else {
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
  }

}