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

int main() {
    cin.tie(0)->sync_with_stdio(0);

    int N;
    cin >> N;

    if (N % 2 == 1)
        cout << 1;
    else
        cout << N / 2;
    cout << "\n";

    return 0;
}