Problem

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阶乘计算

Problem

编写一个带有递归函数的程序来计算阶乘。

输入
第一行包含一个自然数N（  N<=12 ）。

印记
打印数字的阶乘。
例子 <头> <日># <正文>

time 1000 ms
memory 256 Mb
Rules for program design and list of errors in automatic problem checking

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输入 输出
1 1 1
2 2 2