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

using ll = int64_t;
using ull = uint64_t;
using vi = vector<int>;
using vc = vector<char>;
using vs = vector<string>;
using vd = vector<double>;
using vll = vector<ll>;
using vb = vector<bool>;
using pii = pair<int,int>;
using psi = pair<string,int>;
using pis = pair<int,string>;
using pci = pair<char,int>;
using tiii = tuple<int,int,int>;
using mii = map<int,int>;
using mis = map<int,string>;
using msi = map<string,int>;
using mci = map<char,int>;
using si = set<int>;
using ss = set<string>;
using sc = set<char>;
using sll = set<ll>;
using spii = set<pii>;
using qi = queue<int>;
using vvc = vector<vc>;
using vvi = vector<vi>;
using vvb = vector<vb>;
using vvs = vector<vs>;
using vvll = vector<vll>;
using vpii = vector<pii>;
using vpci = vector<pci>;
using mivi = map<int,vi>;
using mivs = map<int,vs>;
using misi = map<int,si>;

int main() {
  int N;
  cin >> N;
  if (N%2 == 0) cout << N/2 << endl;
  else cout << N/2 + 1 << endl;
}