#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Pin numbers for the buttons
const int buttonPin1 = 2; // Change these pin numbers according to your setup
const int buttonPin2 = 3;
const int buttonPin3 = 4;

// Initialize LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);  // Set the LCD address to 0x27 for a 16 chars and 2 line display

// Variables to store button states and timings
int buttonState1 = LOW;
int buttonState2 = LOW;
int buttonState3 = LOW;

// Variables to store button values
int value1 = 0;
int value2 = 0;

void setup() {
  // Initialize LCD
  lcd.init();
  lcd.backlight();
  
  // Set up the button pins as inputs:
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);
  pinMode(buttonPin3, INPUT);
  
  // Initialize serial communication:
  Serial.begin(9600);
}

void loop() {
  // Read the state of the buttons
  buttonState1 = digitalRead(buttonPin1);
  buttonState2 = digitalRead(buttonPin2);
  buttonState3 = digitalRead(buttonPin3);

  // Check if any two buttons are pressed and store their values
  if (buttonState1 == HIGH && buttonState2 == HIGH) {
    value1 = 1;
    value2 = 2;
    delay(200); // Debouncing delay
  } else if (buttonState2 == HIGH && buttonState3 == HIGH) {
    value1 = 2;
    value2 = 3;
    delay(200); // Debouncing delay
  } else if (buttonState3 == HIGH && buttonState1 == HIGH) {
    value1 = 3;
    value2 = 1;
    delay(200); // Debouncing delay
  }

  // If two buttons are pressed within 2 seconds, calculate and print the result
  if (value1 != 0 && value2 != 0) {
    int result = value1 * value2;
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Result: ");
    lcd.print(result);
    Serial.print("Result: ");
    Serial.println(result);
    delay(2000); // Display the result for 2 seconds
    value1 = 0; // Reset value1
    value2 = 0; // Reset value2
  }
}