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

typedef long long ll;
#define int ll
#define pii pair<int , int>
#define _FastIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define pb emplace_back
#define pii pair<int , int>
#define F first
#define S second
#define M_PI 3.14159265358979323846
const int mod = 1000000007;
const int MAXX = 1e2 + 5;

int t , n;

int gcd(int a , int b){
    return (a ? gcd(b % a , a) : b);
}

signed main()
{
    _FastIO;
        cin >> n;
        if(n % 2){
            cout << "1" << endl;
            return 0;
        }
        cout << (n / 2) + 1 << endl;
    return 0;
}