#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("12perm.in");
ofstream fout("12perm.out");
long long dp[15000005];
const int mod=1048576;
int main()
{
    long long n,l=6;
    fin>>n;
    dp[1]=1;dp[2]=2;dp[3]=6;dp[4]=12;
    for(int i=5;i<=n;i++,l+=2)
        dp[i]=((dp[i-1]%mod+dp[i-3]%mod)%mod+l%mod)%mod;
    fout<<dp[n];
    return 0;
}