int cislo = 0;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  SREG |= 1<<7;
  DDRD &= ~(1<<2);
  DDRD &= ~(1<<3);
  PORTD |= 1<<2;
  PORTD |= 1<<3;
  EICRA |= 1<<ISC11;
  EICRA |= 1<<ISC01;
  EICRA &= ~(1<<ISC10);
  EICRA &= ~(1<<ISC00);
  EIMSK |= 1<<INT0;
  EIMSK |= 1<<INT1;
}

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

ISR(INT0_vect) {
  Serial.println(++cislo);
}

ISR(INT1_vect) {
  Serial.println(--cislo);
}