文件目录

#include <iostream>
using namespace std;
int main()
{
    int n, s = 0, ss = 1;
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        ss *= i;
        ss %= 1000000;
        s += ss;
        s %= 1000000;
    }
    cout << s;
    return 0;
}