#include<stdio.h> int fun(int n) { int f; if (n==1||n==2) { return n; } else { f=n*fun(n-1); } return f; } int main() { int n,sum=0; scanf("%d",&n); for(int i=1;i<=n;i++) { sum+=fun(i); } printf("%d\n",sum); return 0; }
posted on 2013-05-09 21:04 Bonke 阅读(238) 评论(0) 编辑 收藏 举报
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