#define LED1 0
#define LED2 2
#define LED3 4
#define LED4 5
#define LED5 18
#define LED6 19
#define LED7 21
#define LED8 22

void setup() {
  // Set all LED pins as outputs
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);
  pinMode(LED5, OUTPUT);
  pinMode(LED6, OUTPUT);
  pinMode(LED7, OUTPUT);
  pinMode(LED8, OUTPUT);
}

void loop() {
  for (int i = 0; i < 256; i++) {
    displayNumber(i);
    delay(500); // Delay for half a second
  }
}

void displayNumber(int num) {
  digitalWrite(LED1, num & 0x01);
  digitalWrite(LED2, num & 0x02);
  digitalWrite(LED3, num & 0x04);
  digitalWrite(LED4, num & 0x08);
  digitalWrite(LED5, num & 0x10);
  digitalWrite(LED6, num & 0x20);
  digitalWrite(LED7, num & 0x40);
  digitalWrite(LED8, num & 0x80);
}