using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        if (c[0] < c[1])
        {
            WriteLine("INF");
            return;
        }
        var ans = 0;
        for (var x = c[0]; x <= c[0] * 2; ++x)
        {
            if ((x & c[0]) != c[0]) continue;
            for (var y = x; y <= x + c[1]; ++y)
            {
                if ((x & y) == c[0]) ++ans;
            }
        }
        WriteLine(ans);
    }
}