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

#define int long long
#define MAX_N (200005)
#define INF (1LL<<60)
#define debug(x) cerr << #x <<":"<< x << endl;
#define debugVec(x) for(auto p:(x)) cerr << p <<" "; cerr << endl;
#define debugVecPair(x) for(auto p:(x)) cerr << #x <<": "<< p.first <<" "<< p.second << endl;
#define debugIdx(i, x) cerr << #i <<" : "<< i <<" "<< #x <<" : "<< x << endl;
const int MOD = (int)1e9+7;

signed main() {
    int N;
    cin >> N;

    cout << (int)ceil(N/2.0) << endl;

}