const int buttonPin = 2;
int timer = 100;
int ledPins[] = {13, 12, 14, 27, 26, 25, 33, 32};
int pinCount = 8;
int buttonState = 0;

void setup() {
  pinMode(buttonPin, INPUT_PULLDOWN);
  for (int i = 0; i < pinCount; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void loop() {
  buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH) {
    for(int i = 0; i<5 ; i++){
    for (int i = 0; i < pinCount; i++) {
      digitalWrite(ledPins[i], HIGH);
      delay(timer);
      digitalWrite(ledPins[i], LOW);
  }
  for (int i = pinCount - 1; i >= 0; i--) {
    digitalWrite(ledPins[i], HIGH);
   delay(timer);
    digitalWrite(ledPins[i], LOW);
  }
    }
  } else {
  for (int i=0; i<pinCount; i++){
    digitalWrite(ledPins[i], LOW);
  }
  }
}