#include <bits/stdc++.h>
using namespace std;
int dx[] = {0, 0, -1, 1, 1, 1, -1, -1};
int dy[] = {-1, 1, 0, 0, 1, -1, 1, -1};
void fast() {
  std::ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  cout.tie(NULL);
}
int main() {
  fast();
  int n;
  cin >> n;
  cout << (n / 2) + 1;
}
