for (int c0 = 1; c0 <= 100; c0 += 1) {

  if (n >= 2)

    s0(c0);

  for (int c1 = 1; c1 <= 100; c1 += 1) {

    if (n >= 2)

      s1(c0, c1);

    s2(c0, c1);

  }

}