#17082. 求n！的值
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ID: 17082
Type: Default
1000ms
128MiB
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求n！的值
说明
输入n,求n!的值。n!=1*2*3*...*n输入格式
一行：一个正整数n,1<=n<=2000输出格式
一行：表示n!的数202432902008176640000