byte s[] = {15, 13, 4, 5, 18, 21, 19, 22};

void setup() {
pinMode(s[0], OUTPUT);
pinMode(s[1], OUTPUT);
pinMode(s[2], OUTPUT);
pinMode(s[3], OUTPUT);
pinMode(s[7], OUTPUT);
}

void loop() {
  digitalWrite(s[0], HIGH);
  digitalWrite(s[1], HIGH);
  digitalWrite(s[2], HIGH);
  digitalWrite(s[3], HIGH);
  digitalWrite(s[7], HIGH);
  delay(1000);
}