时间限制: 2s
内存限制: 192MB 提交: 1129 解决: 198
题目描述
求：S=1! * 2! *3! *... *n!的末尾有多少个0
输入格式
输入数据共一行，一个正整数n，意义如“问题描述”。
输出格式
输出一行描述答案：一个正整数k，表示S的末尾有k个0
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