编辑代码

#include <stdio.h>

int main()
{
    int n = 0;
    scanf ("%d", &n);

    int i = 0;
    int ret = 1;
    int sum = 0;
    int j = 0;

    for(j=1;j <= n;j++)
    {
        for (j = 1; i <= j; j++)
        {
            ret *= i;
        }
        sum+=ret;
    }

    printf("%d\n",sum);
}