#include <iostream>
using namespace std;

int main(void) {
    int n;
    cin >> n;
    int plus = n * (n-1) / 2;
    for (int i = n; i >= 1; i--) {
        if (0 == (plus % i)) {
            cout << i << endl;
            break;
        }
    }
    return 0;
}