#include <iostream>
using namespace std;

long long int gcdr (long long int a,long long int b )
{
  if ( a==0 ) return b;
  return gcdr ( b%a, a );
}

int main() {
	// your code goes here
	long long int n,a;
	std::cin>>n;
	a=(n-1)*n/2;
	std::cout<<gcdr(a,n)<<"\n";
	return 0;
}