Piece_Of_Cake

using System;

class PieceOfCake
{
    static void Main()
    {
        long A = long.Parse(Console.ReadLine());
        long B = long.Parse(Console.ReadLine());
        long C = long.Parse(Console.ReadLine());
        long D = long.Parse(Console.ReadLine());

        long nominator = (A * D) + (B * C);
        long denominator = (B * D);

        decimal division = (decimal)nominator / denominator;

        if (division >= 1)
        {
            Console.WriteLine("{0}", (long)division);
        }
        else
        {
            Console.WriteLine("{0:F22}", division);
        }
        Console.WriteLine("{0}/{1}", nominator, denominator);
    }
}