Blink a row of 8 leds using a potentiometer

blinking_leds.c

void setup()
{
  for (int i=6; i<=13; i++)
  {
      pinMode(i, OUTPUT);
  }
}

int n = 13;
int add = -1;

void loop()
{
  digitalWrite(n, HIGH);
  int d = map(analogRead(A5), 0, 1023, 100, 500);
  delay(d);
  digitalWrite(n, LOW);
  n += add;
  if (n == 5)
  {
      add = 1;
  }
  if (n == 14) {
      add = -1;
  }
}