#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <cstdio>
#include <functional>
#include <set>
#include <sstream>
#include <map>
#include <queue>
#include <stack>

using namespace std;

long long gcd(long long x,long long y){
    return y==0 ? x : gcd(y,x%y);
}

int main()
{

    long long n;
    cin>>n;
    
    long long x=gcd(n,(1+n)*n/2);
    cout<<x<<endl;

    return 0;
}