#define S1 2
#define S2 3
#define S3 4

#define L1 6
#define L2 5

int menu;

void setup() {
  pinMode(S1, INPUT_PULLUP);
  pinMode(S2, INPUT_PULLUP);
  pinMode(S3, INPUT_PULLUP);

  pinMode(L1, OUTPUT);
  pinMode(L2, OUTPUT);
}

void loop() {
    if (digitalRead(S1) == 0 && menu == 0){
      digitalWrite(L1, HIGH);
      menu = 1;
    }

    if (digitalRead(S2) == 0 && menu == 1){
      digitalWrite(L1, LOW);
      digitalWrite(L2, LOW);
      menu = 0;
    }

    if (digitalRead(S3) == 0 && menu == 0){
      digitalWrite(L2, HIGH);
      menu = 1;
    }
}