1 for (int c0 = 3; c0 <= 26; c0 += 3) 2 S2(c0, c0 / 3); 3 S1(27); 4 S2(27, 9); 5 for (int c0 = 30; c0 <= 100; c0 += 3) 6 S2(c0, c0 / 3); 7