#include <fstream>

using namespace std;

#define int long long

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

signed main()
{
    in>>n;

    dp[0][0] = 1;

    for(int i = 1; i<=n; i++)
    {
        for(int j = 1; j<=n; j++)
        {
            for(int k = i - 1; k>=0; k -= 2)
            {
                dp[i][j] += dp[k][j - 1];
            }
        }
        dp[i][0] = 1;
    }

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

    for(int i = start; i<=n; i += 2)
    {
        ans += dp[n][i];
    }

    out<<ans;

    return 0;
}