#include <fstream>

using namespace std;

#define int long long

ifstream in("nunta.in");
ofstream out("nunta.out");
int n, ans;
int fact[1005];

int comb(int n, int k)
{
    int ans = (fact[n] / fact[k]);
    ans /= fact[n - k];

    return ans;
}

int starsandbars(int cutii, int obiecte)
{
    return comb(cutii + obiecte - 1, cutii - 1);
}

signed main()
{
    in>>n;

    fact[0] = 1;
    for(int i = 1; i<=n; i++)
    {
        fact[i] = (fact[i - 1] * i);
    }

    int start;
    if(n % 2 == 0)
    {
        start = 0;
    }
    else
    {
        start = 1;
    }

    for(int i = start; i<=n; i += 2)
    {
        int cutii = i + 1;
        int obiecte = (n - i) / 2;

        ans += starsandbars(cutii, obiecte);

//        out<<cutii<<" "<<obiecte<<'\n';
    }

    out<<ans;

    return 0;
}