#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using VI = vector<int>;
using P = pair<int, int>;
constexpr int INF = 1001001001;
constexpr ll LINF = 1001001001001001001ll;
#define rep(i, n) for (ll i = 0; i < (int)(n); i++)

int main(){
    int ans = 0;
    int n;
    cin >> n;
    ans = n / 2;
    // vector<vector<int>> v(n, vector<int>(m));
    vector<int> v(n);
    if(n%2 == 1) {
        ans ++;
    }
    

    cout << ans << endl;

}