using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        Int64 n = Int64.Parse(Console.ReadLine());
        Int64 temp = n * ( n - 1 )/2;
        Int64 i ;
        Int64 ans;
        var list = new List<Pair>();

        i = 2;
        while(temp != 1)
        {
            Int64 count = 0;

            while (temp % i == 0)
            {
                count++;
                temp /= i;
            }

            if (count > 0)
                list.Add(new Pair(i, count));

            i++;
        }

        ans = 1;

        foreach (Pair p in list)
        {
            ans *= ((Int64)(Math.Pow(p.x, p.n+1)) - 1) / (p.x - 1);
        }

        Console.WriteLine(ans);
    }
}

struct Pair
{
    public Int64 x;
    public Int64 n;

    public Pair(Int64 x, Int64 n)
    {
        this.x = x;
        this.n = n;
    }
}