bool test = true;
  byte i=0;
  bool smer = true;

void setup() {
  DDRD = 0xFF;
  PORTB &= ~(1<<5);
}

void loop() {
  if ((PINB&(1<<5)) == LOW && test == true)
  {
    test = false;
    if ( smer == true)
    {
      i++;
    }
    else
    {
      i--;
    }
    
    PORTD = i;
  }
  else if ((PINB&(1<<5)) == LOW && test ==false)
  {
    test = true;
  }
  
  

  
}