#include <bits/stdc++.h>
using namespace std;
int main() {
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
  int n;
  cin >> n;
  if (n % 2 == 0)
    cout << n / 2;
  else {
    cout << n / 2 + 1;
  }
  return 0;
}
