int mode = 0;
#include <LCD_I2C.h>
LCD_I2C lcd(0x27, 16, 2);
void setup(){
pinMode(A0, INPUT_PULLUP);
pinMode(A1, INPUT_PULLUP);   
pinMode(A2, INPUT_PULLUP);
lcd.begin();
lcd.backlight();
}
void loop()
{
if (digitalRead(A0) == LOW)
{
   mode = mode + 1;
   delay(300);
   lcd.clear();
}
//if (mode>=0 && mode<=100);
   lcd.setCursor(7,0);
   lcd.print(mode);
   delay(200);
   lcd.clear();
if (digitalRead(A1) == LOW)
{
   lcd.clear();
   mode = 0;
} 
if (digitalRead(A2) == LOW)
{
   mode = mode-1 ;
   if (mode<0) mode =0;
   delay(300);
   lcd.clear(); 
}
}