#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;
using P = pair<int, int>;

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