#include <fstream>
#define mod (1<<20)-1
#define nmax 15000001
using namespace std;
ifstream f("12perm.in");
ofstream g("12perm.out");
int n,v[nmax];

int main()
{
    int i;
    f>>n;
    v[1]=1;v[2]=2;
    v[3]=6;v[4]=12;
    for (i=5;i<=n;++i) {
        v[i]=v[i-1]+v[i-3]+(i-2)*2;
        v[i]&=mod;
    }
    g<<v[n]<<'\n';
    return 0;
}