#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n;
  cin >> n;
  if (n == 1)
    cout << n;
  else if (n % 2 == 0)
    cout << n / 2;
  else if (n % 2 == 1)
    cout << n / 2 + 1;
  return 0;
}
