#include <bits/stdc++.h>

using namespace std;

int main(int argc, char *argv[]) {
    int N;
    cin >> N;
    int ans = 0;
    if (N % 2 == 0) {
        ans = N / 2;
    } else {
        ans = (N / 2) + 1;
    }            
    cout << ans << endl;
	return 0;
}