using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var N = int.Parse(Console.ReadLine());
        var A = 0;
        var list = new List<int>();
        for (int i = 1; i <= N; i++)
        {
            if (N % i == 0)
            {
                list.Add(i);
                A += i;
            }
        }

        var bunshiOfB = list.Select(x => N / x).Sum();
        Console.WriteLine(A * N / bunshiOfB);
    }
}