#include<btis/stdc++>
#include<bits\stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
using ll = long long;
using namespace std;

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


    
}