#D. 【例29.1】求阶乘

Type: RemoteJudge

1000ms

256MiB

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说明

利用for循环求 $n!$ 的值。
提示， $n!=1×2×...×n$ 。

输入一个正整数 $n$ ,对于所有数据, $1≤n≤20$ 。

输出 $n!$ 的值。