#include<bits/stdc++.h>
using namespace std;

int a[1005];

int main()
{
    int n;
    cin >> n;
    for(int i = 1; i <= n; i++)
    { 
        for(int j = 1; j <= i / 2; j++)
            a[i] += a[j];
        a[i]++;
    }
    cout << a[n] << endl;
    return 0;
}