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


fun findAns l r =
    let
        fun findAnsLoop limit current arr =
            if current = limit
            then Array.foldl (fn (x, acc) => if x = true then acc + 1 else acc) 0 arr
            else
                (
                  if 1 <= current andalso current <= 295 then Array.update (arr, 0, true)
                  else if 296 <= current andalso current <= 416 then Array.update (arr, 1, true)
                  else Array.update (arr, 2, true);
                  findAnsLoop limit (current + 1) arr         
                )
    in
        findAnsLoop (r + 1) l (Array.array (3, false)) - 1
    end


val () =
    let
        val l = readInt ()
        val r = readInt ()
        val ans = findAns l r
    in
        print (Int.toString ans ^ "\n")
    end