百练 2684 求阶乘的和

题目链接：http://bailian.openjudge.cn/practice/2684

# include <stdio.h>
int main()
{
	int n,i,j,s=0;
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		for(j=1;j<=n;j++)
		{	
			i=i*j;
			s=s+i;
		}
	}
	printf("%d\n",s);
	return 0;
}