#include <iostream>
using namespace std;

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