题解 | #24点游戏算法#

def f(nums, tar):
    if len(nums) == 1:
        return nums[0] == tar
    for i in range(len(nums)):
        t = nums[i]
        c = nums[:i] + nums[i + 1 :]
        if f(c, tar + t) or f(c, tar - t) or f(c, tar * t) or f(c, tar / t):
            return True
    return False


ls = list(map(int, input().split()))
if f(ls, 24):
    print("true")
else:
    print("false")