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


class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        int[] inpt = Reader.ReadLine().Split(' ').Select(a => int.Parse(a)).ToArray();
        int koubai = inpt[0] * inpt[1] / Kouyaku(inpt[0], inpt[1]);

        int ans = (koubai / inpt[1]) - 1;
        Console.WriteLine(ans);

    
    }

    private int Kouyaku(int int1, int int2)
    {
        if (int1 % int2 == 0)
        {
            return int2;
        }
        else
        {
            return Kouyaku(int2, int1 % int2);
        }

    }



    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"






5 2







";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}