ikun

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

int dfs(int x,int cnt){
if (x <= 1){
return cnt;
}
int a = cnt;
for (int i = 1;i<=x/2;i++){
cnt += dfs(i,1);
}
return cnt;
}

int main(){
int n;
cin>> n;
cout<< dfs(n,1);
}