int LedPins[] = {8, 9, 10, 11}; 
int JumplahLed = 4;

void setup() {
  for (int i = 0; i < JumplahLed; i++) {
    pinMode (LedPins[i], OUTPUT);
  }
}


void loop() {
  for (int i = 0; i < JumplahLed; i++) {
    digitalWrite(LedPins[i], HIGH);
    delay(200);
    digitalWrite(LedPins[i], LOW);
  }


for (int i = JumplahLed - 3; i >= 0; i--) {
  digitalWrite(LedPins[i], HIGH);
  delay(200);
  digitalWrite(LedPins[i], LOW);
}
}