#include<bits/stdc++.h>
using namespace std;
#define MOD 1000000
int main()
{
    int i, j, n, m, S = 0;
    scanf("%d", &n);
    for(i = 1; i <= n; i++)
    {
        m = 1;
        for(j = 1; j <= i; j++) m = (m*j) % MOD;
        S = (S+m) % MOD;
    }
    printf("%d\n", S);
    return 0;
}