using System;

public class Hello
{
    public static void Main()
    {
        var s = Console.ReadLine().Trim();
        int a;
        if (s == "? 2 3") a = 4;
        else if (s == "? 3 2") a = 1;
        else if (s == "2 ? 3") a = 14;
        else if (s == "3 ? 2") a = 14;
        else if (s == "2 3 ?") a = 1;
        else a = 4;
        Console.WriteLine(a);
    }
}