using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var p = PDiv(n);
        var ans = 0L;
        foreach (var kv in p) ans += kv.Key * kv.Value;
        WriteLine(ans);
    }
    static Dictionary<long, long> PDiv(long n)
    {
        var dic = new Dictionary<long, long>();
        var tmp = n;
        while (tmp % 2 == 0)
        {
            tmp /= 2;
            if (dic.ContainsKey(2)) ++dic[2];
            else dic.Add(2, 1);
        }
        for (var p = 3L; p * p <= n; p += 2)
        {
            while (tmp % p == 0)
            {
                tmp /= p;
                if (dic.ContainsKey(p)) ++dic[p];
                else dic.Add(p, 1);
            }
            if (tmp == 1) break;
        }
        if (tmp > 1) dic.Add(tmp, 1);
        return dic;
    }
}