const int ledPins[] = {2, 3, 4, 5};
const int button1Pin = 6;
const int button2Pin = 7;

int button1PressCount = 0;
unsigned long lastDebounceTime = 0;
const int debounceDelay = 50;

void setup() {
  for (int i = 0; i < 4; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW);
  }
  
  pinMode(button1Pin, INPUT_PULLUP);
  pinMode(button2Pin, INPUT_PULLUP);
}

void loop() {
  int button1State = digitalRead(button1Pin);
  int button2State = digitalRead(button2Pin);
  
  if (button1State == LOW && button2State == LOW) {
    delay(debounceDelay);
    if (digitalRead(button1Pin) == LOW && digitalRead(button2Pin) == LOW) {
      bool allLedsOn = true;
      for (int i = 0; i < 4; i++) {
        if (digitalRead(ledPins[i]) == LOW) {
          allLedsOn = false;
          break;
        }
      }
      
      if (allLedsOn) {
        for (int i = 0; i < 4; i++) {
          digitalWrite(ledPins[i], LOW);
        }
      } else {
        for (int i = 0; i < 4; i++) {
          digitalWrite(ledPins[i], HIGH);
        }
      }
      
      button1PressCount = 0;
      
      while (digitalRead(button1Pin) == LOW || digitalRead(button2Pin) == LOW) {
        delay(10);
      }
      return;
    }
  }
  
  if (button1State == LOW && millis() - lastDebounceTime > debounceDelay) {
    lastDebounceTime = millis();
    button1PressCount++;
    
    while (digitalRead(button1Pin) == LOW) {
      delay(10);
    }
    
    if (button1PressCount == 3) {
      digitalWrite(ledPins[2], HIGH);
      digitalWrite(ledPins[3], LOW);
    } else if (button1PressCount == 4) {
      digitalWrite(ledPins[3], HIGH);
      digitalWrite(ledPins[2], LOW);
      button1PressCount = 0;
    }
  }
  
  delay(10);
}