#include<bits/stdc++.h>
using namespace std;
  
int main(){
    int n;
    cin>>n;
    if(n % 2 == 0){
        cout<<n / 2 + n / 2 + 1<<endl;
    } else{
        cout<<n / 2 + 1<<endl;
    }
}
/**************************************************************
	Problem: 1558
	User: yangjunwen
	Language: C++
	Result: Accepted
	Time:41 ms
	Memory:2072 kb
****************************************************************/