#include <iostream>
#include <vector>
using namespace std;

int c(int n) {
    vector<int> dp(n + 1, 0);
    dp[0] = 1;
    
    for (int i = 1; i <= n; ++i) {
        for (int k = 0; k <= i / 2; ++k) {
            dp[i] += dp[k];
        }
    }
    
    return dp[n];
}

int main() {
    int n;
    cin >> n;
    cout << c(n) << endl;
    return 0;
}