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

int main() {
    int N;
    cin >> N;
    if(N == 1) {
        cout << 1 << endl;
    }
    else if(N == 2) {
        cout << 2 << endl;
    }
    else {
        if(N%2 == 0) {
            cout << N/2-1 << endl;
        }
        else {
            cout << (N+1)/2 << endl;
        }
    }
}