using System.Collections.Generic;
using System;

public class Hello
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        var d = PF(n);
        var ans = 0;
        foreach(var x in d) ans += x.Key * x.Value;
        Console.WriteLine(ans);
    }
    static Dictionary<int, int> PF(int n)
    {
        var d = new Dictionary<int, int>();
        for (int i = 2; i * i <= n; i++)
        {
            if (n % i != 0) continue;
            var x = 0;
            while (n % i == 0)
            {
                x++;
                n /= i;
            }
            d[i] = x;
        }
        if (n != 1) d[n] = 1;
        return d;
    }
}