#iclude<LiquidCrystal_I2C.h>
int cislo = 0;
LiquidCrystal_I2C.h lcd (0*27,16,2)
bool doslo = true   ;
pinMode(2, INPUT);
digitalWrite(2, HIGH);
pinMode(3, INPUT);
digitalWrite(3, HIGH);
lcd.init;
attachInterrupt(digitalPinToInterrupt(2)priorita1,FALLING);
attachInterrupt(digitalPinToInterrupt(3)priorita2,FALLING);
void setup() {
  void priorita1 ()
  cislo++ ;
 
}

  void priorita2 ()
  cislo-- ;


void loop() 
if(doslo == true )
doslo = false   ;
lcd.clear  ;
lcd.println(cislo)

  

 }