#include <iostream>
using namespace std;

int euclid(int n, int m) {
    if (0 == (n % m)) {
        return m;
    } else {
        return euclid(m, n % m);
    }
}

int main(void) {
    int n;
    cin >> n;
    cout << euclid(n * (n-1) / 2, n) << endl;
    return 0;
}