#include <bits/stdc++.h>
using namespace std;
int caseno = 1;
typedef long long LL;
typedef unsigned long long ULL;
template <class T>
bool Inside(T a, T b, T c) {
  return a <= b && b <= c;
}
template <class T>
inline void SWAP(T &a, T &b) {
  T t = a;
  a = b;
  b = t;
}
inline LL POW(LL base, LL power) {
  LL res = base;
  if (power == 0) return 1;
  for (int I = 0; I < power - 1; I++) res *= base;
  return res;
}
bool IsUpperCase(char c) { return c >= 'A' && c <= 'Z'; }
bool IsLowerCase(char c) { return c >= 'a' && c <= 'z'; }
bool IsLetter(char c) { return c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z'; }
bool IsVowel(char c) {
  return (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u' ||
          c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U');
}
int ToInt(string s) {
  int r = 0;
  istringstream sin(s);
  sin >> r;
  return r;
}
double ToDouble(string s) {
  double r = 0;
  istringstream sin(s);
  sin >> r;
  return r;
}
string ToString(int n) {
  string s;
  stringstream convert;
  convert << n;
  s = convert.str();
  return s;
}
const int SIZE = 1e6;
int main() {
  std::ios_base::sync_with_stdio(0);
  int T, I, J, K, N, n, m, k, cnt = 0, len;
  cin >> n;
  cout << (n / 2) + 1 << '\n';
  return 0;
}
