void setup() {
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(4, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);
  pinMode(6, INPUT_PULLUP);
}

void loop() {
  bool sw4 = digitalRead(4);
  bool sw5 = digitalRead(5);
  bool sw6 = digitalRead(6);
  if (sw4 == 0 && sw5 == 1 && sw6 == 1 || sw4 == 1 && sw5 == 0 && sw6 == 1 || sw4 == 1 && sw5 == 1 && sw6 == 0) {
    digitalWrite(11, HIGH);
    digitalWrite(12, LOW);
    digitalWrite(13, LOW);
  }
  else if (sw4 == 0 && sw5 == 0 && sw6 == 1 || sw4 == 1 && sw5 == 0 && sw6 == 0 || sw4 == 0 && sw5 == 1 && sw6 == 0) {
    digitalWrite(11, HIGH);
    digitalWrite(12, HIGH);
    digitalWrite(13, LOW);
  }
  else if (sw4 == 0 && sw5 == 0 && sw6 == 0) {
    digitalWrite(11, HIGH);
    digitalWrite(12, HIGH);
    digitalWrite(13, HIGH);
  }
  else {
    digitalWrite(11, LOW);
    digitalWrite(12, LOW);
    digitalWrite(13, LOW);
  }
}