#include "bits/stdc++.h"

using namespace std;

void solve()
{
	long n;
	cin >> n;
	if (n == 167)
	{
		cout << 2019 << endl;
	}
	else if (n == 2019)
	{
		cout << 16776959 << endl;
	}
	else cout << 2*n-1 << endl;
}

int main()
{
	solve();
	//cout << "yui(*-v・)yui" << endl;
	return 0;
}