fun readInt () =
    valOf (TextIO.scanStream (Int.scan StringCvt.DEC) TextIO.stdIn)


fun intPow (x, y) =
    let
        fun loop n =
            if n = 0 then 1
            else x * loop (n - 1)
    in
        loop y
    end


fun findAns i base limit =
    if limit < i * base then 0
    else 1 + findAns (i + 1) base limit


val () =
    let
        val n = readInt ()
        val k = readInt ()
        
        val ans =
            if k = 0 then intPow (2, n)
            else findAns 1 (intPow (2, k)) (intPow (2, n))
    in
        print (Int.toString ans ^ "\n")
    end