只因

#include<bits/stdc++.h>
using namespace std;
int kunkun(int n){
int lists=0;
for(int i=n/2;i>=0;i--){
if(i>1){
lists+=kunkun(i);
}
else lists++;
}
return lists;
}
int main(){
int n;
cin>>n;
cout<<kunkun(n);
return 0;
}