用循环结构求和s怎么写

int main()
{
    int i = 1;
    int sum = 0;
    int s = 0;
    int n = 0;
    printf("please input a num:");
    scanf_s("%d", &n);
    for (i=1;i<=n;i++)
    {
        if (i <= n)
        {
            sum += i;
            for (;; sum++)
            {
                s += sum;
                printf("%d\n", s);
            }
        }
    }
    return 0;
}