int cislo = 0;

void setup() {

  Serial.begin(9600);
  Serial.println("cislo");
  // put your setup code here, to run once:
  DDRD &= ~(0b11100000);
  PORTD |= 0b11100000;

  SREG |= 1<<7;
  PCICR |= 1<<PCIE2;
  PCMSK2 |= 1<<PCINT23;
  PCMSK2 |= 1<<PCINT22;
  PCMSK2 |= 1<<PCINT21;


  
}

void loop() {
  // put your main code here, to run repeatedly:

}


ISR(PCINT2_vect)
{
  if((PIND&(1<<7)) == 0)
  {
    cislo--;
    Serial.println(cislo);
  }
  else if((PIND&(1<<6)) == 0)
  {
    cislo++;
    Serial.println(cislo);
  }
  else if((PIND&(1<<5)) == 0)
  {
    cislo = 0;
    Serial.println(cislo);
  }
  
}