char digit[] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x7, 0x7F, 0x6F};
int number;
int vhod;

void setup() {
  randomSeed(analogRead(A0));
  number = random(5);
  DDRD = 0xFF;
  DDRB &= 0b00000000;
}

void loop() {
  vhod = PINB & 0b00000001;
  if(vhod == 0b00000000){
    if(number < 9){
      number++;
      delay(300);
    }
  }
  PORTD = digit[number];

}