Problem D: 26-递归-求 N！的值 Problem D: 26-递归-求 N！的值
Time Limit: 1 Sec Memory Limit: 128 MB
Submit: 4 Solved: 2
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用递归算法，求 N！的精确值(N 以一般整数输入)。
Input
输入整数N
Output
按样例格式输出答案
Sample Input
10
Sample Output
10!=3628800
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