using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var line = Console.ReadLine().Split(' ');
        int idx = 0;
        for (int i = 0; i < line.Length; i++)
        {
            if (line[i] == "?")
            {
                idx = i;
                break;
            }
        }

        string result = string.Empty;
        line[idx] = "1";
        result = (line.Min().CompareTo(line[1]) == 0 || line.Max().CompareTo(line[1]) == 0) ? "1" : "4";

        if (result == "1")
        {
            line[idx] = "4";
            result = (line.Min().CompareTo(line[1]) == 0 || line.Max().CompareTo(line[1]) == 0) ? "14" : "1";
            Console.WriteLine(result);
        }
        else Console.WriteLine(result);
    }
}