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

LiquidCrystal_I2C lcd(0x27, 16, 2);
  int In;
  int Out;
 int S=0;
   byte customChar1[] = {
  B00000,
  B00000,
  B01010,
  B11111,
  B01110,
  B00100,
  B00000,
  B00000
};
  byte customChar2[] = {
  B00000,
  B00000,
  B01010,
  B11111,
  B01110,
  B00100,
  B00000,
  B00000
};
 void setup() {
  pinMode(A0,INPUT);
  pinMode(A1,INPUT);
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("IN =");
  lcd.setCursor(0, 1);
  lcd.print("OUT=");
  LiquidCrystal_I2C lcd(0x27,16,2);  
  lcd.setCursor(7,0);
  lcd.print("Total:");
 lcd.setCursor(7,1);
  lcd.print("See you");
 lcd.createChar(0,customChar1);
 lcd.home();
 lcd.setCursor(15,1);
 lcd.write(0);
  lcd.createChar(1,customChar2);
 lcd.home();
 lcd.setCursor(14,1);
 lcd.write(1);
}

void loop(){
  if (In && Out) {
      lcdUpdate();
     
     }
  if(digitalRead(A0) == LOW&&In <= 999){
     In++;
     delay(600);}
     
  if(digitalRead(A1) == LOW&&Out <= 999){
     Out++;
    delay(600);
     }
     S=(In-Out); 
    }
    
    void lcdUpdate() {
  lcd.setCursor(2, 0);
  lcd.print("=");
  lcd.print(In);
   lcd.setCursor(1, 1);
  lcd.print("UT=");
  lcd.print(Out);
  lcd.setCursor(7, 0);
  lcd.print("Total=");
  lcd.print(S);
}