using static System.Console;
using System.Linq;
namespace App
{
    class Prog
    {
        static void Main()
        {
            var x = ReadLine().Split().ToArray();
            if (x[1] == "?")
            {
                WriteLine("14");
                return;
            }
            WriteLine((x[0] == "2" || x[2] == "2") ? "1" : "4");
        }
    }
}