/**
*    author:  shu8Cream
*    created: 12.03.2021 21:27:18
**/

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i=0; i<(n); i++)
#define all(x) (x).begin(), (x).end()
using ll = long long;
using P = pair<int,int>;
using vi = vector<int>;
using vvi = vector<vi>;

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n;
    cin >> n;
    int ans = 0;
    if(n%2==1) ans=1;
    if(n%2==0) ans=n/2+1;
    if(n==2) ans=2;
    cout << ans << endl;
}