#include<stdio.h>

#define MOD 999017
#define ll long long
 
int sol,d[1005],n;
 
int main ()
{
    int i,j;
    freopen("sortari2.in","r",stdin);
    freopen("sortari2.out","w",stdout);
    scanf("%d",&n);
    d[0]=d[1]=1;
    for(i=2;i<=n;i++)
    {
        d[i]=d[i-1];
        for(j=1;j<=i-1;j++)
        {
            d[i]+=d[j];
            if(d[i]>=MOD)
                d[i]%=MOD;
        }
    }
   sol=1;
    for(i=2;i<=n;i++)
    {
        sol*=i;
        sol%=MOD;
    }
    sol-=d[n];
    if(sol<0)
        sol+=MOD;
    printf("%d\n",sol);
    return 0;
}