#include <iostream>

using namespace std;

int gcd(unsigned long int a,unsigned long int b)
{
        if(b == 0) return 1;
        return a % b ? gcd(b,a%b) : b;
}

int main()
{
        unsigned long int num;

        cin >> num;

        cout << gcd(num,num*(num-1)/2) << endl;

        return 0;
}