for (int c0 = 3; c0 <= 24; c0 += 3)
S2(c0, c0 / 3);
S1(25);
for (int c0 = 27; c0 <= 100; c0 += 3)
S2(c0, c0 / 3);
for (int c0 = 3; c0 <= 24; c0 += 3)
S2(c0, c0 / 3);
S1(25);
for (int c0 = 27; c0 <= 100; c0 += 3)
S2(c0, c0 / 3);