using System;

namespace Timus
{
    class Program
    {
        static void Main()
        {
            string nums = Console.ReadLine();
            int a = Convert.ToInt32(nums.Substring(0, 1));
            int b = Convert.ToInt32(nums.Substring(2, 1));
            int c = a + b;
            Console.WriteLine(c);
        }
    }
}