using System;
using System.Collections.Generic;

using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Problem1
{
    class Program
    {
        static void Main(string[] args)
        {
            var line = rla();
            var n = line.Max();
            var m = line.Min();
                      
            
            Console.WriteLine((m-1) + m * (n-1));
        }

        #region Helper
        public static long rl()
        {
            return long.Parse(Console.ReadLine());
        }

        public static long [] rla()
        {
            var line = Console.ReadLine().Split(' ');
            return Array.ConvertAll(line, long.Parse);
        }

        public static string[] rls()
        {
            return Console.ReadLine().Split(' ');
        }

        public static List<short> GetBitList(long x)
        {
            //4 ~ 0 0 1
            List<short> bitList = new List<short>();
            while (x > 0)
            {
                bitList.Add((short) (x & 1));
                x = x >> 1;
            }
            return bitList;
        }
        #endregion Helper
    }
}