#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
ll gcd(ll a,ll b){
	if(a<b)	a^=b,b^=a,a^=b;
	if(b==0)	return 1;
	while(a%b!=0){
		ll tmp=a%b;
		a=b;	b=tmp;
	}
	return b;
}
int main(){
	ll n;	cin>>n;
	ll x=n*(n-1)/2;
	x=gcd(n,x);
	cout<<x<<endl;
	return 0;
}