nghiem = 0 for a in range(1,10): for b in range(1,10): for c in range(1,10): for d in range(1,10): for e in range(1,10): for f in range(1,10): for g in range(1,10): for h in range(1,10): for i in range(1,10): if (a + 13 * b / c + d + 12 * e - f - 11 + g * h / i - 10) == 66: nghiem += 1 print(nghiem)