const int NUMLEDS          = 5;
const int LEDPINS[NUMLEDS] = {3, 5, 6, 9, 10};
int delayValue             = 1000;

void setup() {
  for (int index = 0; index < NUMLEDS; index++) {
    pinMode(LEDPINS[index], OUTPUT);
  }
}

void loop() {
  for (int index = 0; index < NUMLEDS; index++) {
    digitalWrite(LEDPINS[index], HIGH);
    delay(delayValue);
  }
  for (int index = 0; index < NUMLEDS; index++) {
    digitalWrite(LEDPINS[index], LOW);
    delay(delayValue);
  }
}