题目250：250250
250250Find the number of non-empty subsets of {11, 22, 33,..., 250250250250}, the sum of whose elements is divisible by 250. Enter the rightmost 16 digits as your answer.
题目：
求满足元素和可以被 250 除尽，{11, 22, 33,..., 250250250250} 的非空子集的数目。
输入最右边 16 位数字作为你的答案。
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