#include <bits/stdc++.h>
#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
#include<string>
using ll = long long;
using namespace std;

int main()
{
    ll n;
    cin >> n;
    cout << (!(n%2) ? n/2 : ((n/2)%2) ? (n/4 + 1) : ((n-1)/4+1)) << endl;
}