#define BUTTON_X 2
#define BUTTON_A 5
#define BUTTON_B 4
#define BUTTON_C 3


#define LED_A 10
#define LED_B 9
#define LED_C 8
#define LED_X 11


bool lock = false;
bool stateA = false;
bool stateB = false;
bool stateC = false;
int code[3] = {0, 0, 0}; 

void setup() {
  
  pinMode(BUTTON_X, INPUT);
  pinMode(BUTTON_A, INPUT);
  pinMode(BUTTON_B, INPUT);
  pinMode(BUTTON_C, INPUT);

  
  pinMode(LED_A, OUTPUT);
  pinMode(LED_B, OUTPUT);
  pinMode(LED_C, OUTPUT);
  pinMode(LED_X, OUTPUT);
}

void loop() {

  if (digitalRead(BUTTON_X) == HIGH) {
    lock = !lock;
    digitalWrite(LED_X, lock ? HIGH : LOW);
    delay(500);
  }


  if (!lock) {

    if (digitalRead(BUTTON_A) == HIGH) {
      stateA = !stateA;
      digitalWrite(LED_A, stateA ? HIGH : LOW);
      code[0] = stateA ? 1 : 0;
      delay(500);
    }


    if (digitalRead(BUTTON_B) == HIGH) {
      stateB = !stateB;
      digitalWrite(LED_B, stateB ? HIGH : LOW);
      code[1] = stateB ? 1 : 0;
      delay(500);
    }

    
    if (digitalRead(BUTTON_C) == HIGH) {
      stateC = !stateC;
      digitalWrite(LED_C, stateC ? HIGH : LOW);
      code[2] = stateC ? 1 : 0;
      delay(500);
    }

  
    if (code[0] == 1 && code[1] == 0 && code[2] == 1) {
      for (int i = 0; i < 3; i++) {
        digitalWrite(LED_A, HIGH);
        digitalWrite(LED_B, HIGH);
        digitalWrite(LED_C, HIGH);
        delay(500);
        digitalWrite(LED_A, LOW);
        digitalWrite(LED_B, LOW);
        digitalWrite(LED_C, LOW);
        delay(500);
      }
      code[0] = 0;
      code[1] = 0;
      code[2] = 0;
    }
  }
}