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

  if (n >= 2) {

    s0(c0);

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

      s1(c0, c1);

      s2(c0, c1);

    }

  } else

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

      s2(c0, c1);

}