题解 | #24点游戏算法#向大佬学习，递归YYDS

def fun(num_list, target):

if len(num_list) == 1:
    return num_list[0] == target
else:
    for i in range(len(num_list)):
        list1 = num_list[:i] + num_list[i+1:]
        n = num_list[i]
        if fun(list1, target + n) or fun(list1, target - n) or fun(list1, target * n) or fun(list1, target / n):
            return True
    else:
        return False

while True:

try:
    num_list = [int(i) for i in input().split()]
    if fun(num_list, 24):
        print('true')
    else:
        print('false')
    
except:
    break