void setup() {
  DDRD = 0b00000000;
  Serial.begin(9600);
  pinMode(13, INPUT_PULLUP);
}
bool smer = true;
int i = 0;
int jozo = 0;
bool test = true;
void loop() {
if((PINB& (1<<5)) == 0 && test==true){
  if(i < 9 && smer ==true){
    PORTD |= 1<<i;
    test =false;
    i++;
    if(i ==8){
      smer = false;
      Serial.println(smer);
    }
  }
  else if(i >=0 && smer == false && jozo == 0){
    Serial.println(i);
    PORTD &= ~(1<<i);
    test =false;
    i--;
    jozo = 1;
    if(i == 0){
      smer = true;
    }
  }

}
else if((PINB& (1<<5)) != LOW && test !=true){
  test = true;
  jozo = 0;
}
  

}