攻略：熟练加减乘除四则运算，括弧，因数分解，为后续多个编程项目铺垫。
The 24 Game is an arithmetical card game in which the objective is to find a way to manipulate four integers so that the end result is 24. For example, for the card with the numbers 4, 7, 8, 8, a possible solution is (7 - (8/8))*4 = 24.