#include <iostream>
#include <fstream>
#define Nmax 15000001
using namespace std;
ifstream fin("12perm.in");
ofstream fout("12perm.out");
int dp[Nmax],n;
const int mod=1048576;
int main()
{
    fin>>n;
    if(n<=2)
    {
        fout<<n;
        return 0;
    }
    dp[1]=dp[2]=2;dp[3]=6;
    for(int i=4;i<=n;i++)
        dp[i]=(dp[i-1]+dp[i-3]+2*(i-2))%mod;
    fout<<dp[n];
    return 0;
}