#include <iostream>
#include <cstdint>

using namespace std;

int euc(uint64_t m, int n) {
    if (n == 0)
        return m;
    else
        return euc(n, m % n);
}

int main() {

    ios::sync_with_stdio(false);
    cin.tie(0);

    int n;
    cin >> n;
    uint64_t m = 0;
    for (int i = 0; i < n; ++i) {
        m += i;
    }
    cout << euc(m, n) << endl;
    return 0;
}