#include <bits/stdc++.h>
using namespace std;

int main() {
	int N;
    cin >> N;
    if(N % 2 = 1) {
    cout << N / 2 + 1 << endl;
    }
    
    else if(N % 2 = 0) {
    cout << N / 2 << endl;
    }
}
