using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using Enu = System.Linq.Enumerable;

class Program
{
    public void Solve()
    {
        int[] T = Reader.IntArray(3);
        long TTT = (long)T[0] * T[1] * T[2];
        long maxGcd = -1;

        for (int mask = 0; mask < 4; mask++)
        {
            int sign1 = (mask & 1) * 2 - 1, sign2 = (mask >> 1 & 1) * 2 - 1;
            long a = (long)T[2] * (T[1] + sign1 * T[0]);
            long b = (long)T[1] * (T[2] + sign2 * T[0]);
            long g = GCD(a, b);
            maxGcd = Math.Max(maxGcd, g);
        }
        long g2 = GCD(TTT, maxGcd);
        TTT /= g2;
        maxGcd /= g2;

        Console.WriteLine(TTT + "/" + maxGcd);
    }

    static long GCD(long a, long b)
    {
        while (b != 0) { long r = a % b; a = b; b = r; }
        return a;
    }
}


class Entry { static void Main() { new Program().Solve(); } }
class Reader
{
    private static TextReader reader = Console.In;
    private static readonly char[] separator = { ' ' };
    private static readonly StringSplitOptions op = StringSplitOptions.RemoveEmptyEntries;
    private static string[] A = new string[0];
    private static int i;
    private static void Init() { A = new string[0]; }
    public static void Set(TextReader r) { reader = r; Init(); }
    public static void Set(string file) { reader = new StreamReader(file); Init(); }
    public static bool HasNext() { return CheckNext(); }
    public static string String() { return Next(); }
    public static int Int() { return int.Parse(Next()); }
    public static long Long() { return long.Parse(Next()); }
    public static double Double() { return double.Parse(Next()); }
    public static int[] IntLine() { return Array.ConvertAll(Split(Line()), int.Parse); }
    public static int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); }
    public static int[][] IntTable(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); }
    public static string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Line()).ToArray(); }
    public static string Line() { return reader.ReadLine().Trim(); }
    private static string[] Split(string s) { return s.Split(separator, op); }
    private static string Next() { CheckNext(); return A[i++]; }
    private static bool CheckNext()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return CheckNext();
        A = Split(line);
        i = 0;
        return true;
    }
}