#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define print(s) cout<<(s)<<endl

int main() {
    double N;
    cin >> N;
    int ans;
    ans = ceil(N / 2);
    print(ans);
    return 0;
}