/*
    https://yukicoder.me/problems/no/815
    No.815 Are you a traveller ?
*/
#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    double n;
    cin >> n;
    cout << ceil(n / 2) << endl;
    return 0;
}