#include <iostream>
using namespace std;
int main()
{
    long long n;
    cin>>n;
    auto a=n*(n+1)/2;
    auto b=(n+1)*(n+2)/2;

    auto res=1LL;
    for(auto i=2LL;i*i<=a;++i)
        if (a%i==0 and b%i==0) res=i;

    cout<<res<<endl;
}