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

int main()
{
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    int n ;
    cin >> n ;
    if(n%2==0)
        cout << n/2 << endl;
    else
        cout << (n/2)+1 << endl;
    return 0;
}
