#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int, int>;
constexpr ll INF = (1LL << 30) - 1LL;
constexpr ll LINF = (1LL << 60) - 1LL;
constexpr ll MOD = 1e9 + 7;
template <typename T>
void chmin(T &a, T b) {
  a = min(a, b);
}
template <typename T>
void chmax(T &a, T b) {
  a = max(a, b);
}
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  int a;
  cin >> a;
  cout << a / 2 + 1 << endl;
}
