#include <bits/stdc++.h>
#define pt(sth) cout << sth << "\n"
#define itr(x,c) for(auto x=c.begin();x!=c.end();x++)
#define all(a) (a.begin()),(a.end())
using namespace std;
#include <atcoder/all>
using namespace atcoder;
typedef long long ll;
typedef pair<ll, ll> pll;
template<class T>bool chmax(T &a, const T &b) {if(a<b) {a=b; return 1;} return 0;}
template<class T>bool chmin(T &a, const T &b) {if(b<a) {a=b; return 1;} return 0;}
static const ll INF=1e18;
static const ll MAX=101010;
//static const ll MOD=1e9+7;
//static const ll MOD=998244353;
//vector<ll> a(N);
//for(i=0;i<N;i++) cin>>a[i];

typedef vector<ll> v1D;
typedef vector<v1D> v2D;
typedef vector<v2D> v3D;


int main(){
  ll i,j;
  
  ll N;cin>>N;
  if(N&1)pt(1);
  else{
    pt(N/2+1);
  }
  
}