int ledPin[8] = { 4, 5, 6, 7, 8, 9, 10, 11};

const int buttonPin = 13;
int buttonState = HIGH;
int pushCounter = 0;
int numberOfLED = 8;
void setup() {
  pinMode(buttonPin, INPUT);
  for (int i = 0; i <= 8; i++) {
    pinMode(ledPin[i], OUTPUT);
  }
}

void loop() {
  buttonState = digitalRead(buttonPin);
  if (buttonState == LOW) {
    for (int i = 0; i < numberOfLED; i++) {
      if (pushCounter % numberOfLED == i) {
        digitalWrite(ledPin[i], HIGH);
        delay(5000);
        digitalWrite(ledPin[i],LOW);
      }
      
      else {
        digitalWrite(ledPin[i], LOW);
      }
    }
    pushCounter++;
    delay(30000);
  }
}