import math
count = 0
for x in range(1, 5):
    for y in range(1, 5):
        for z in range(1, 5):
            if x != y and x != z and y != z:
                print(x, y, z)
                count = count + 1
print("四个数字：1、2、3、4，能组成{}个互不相同且无重复数字的三位数".format(count) )