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


val () =
    let
        val a = readInt ()
        val b = readInt ()

        val min = Int.min(a, b)
        val diff = abs (a - b)
        
        val ans = if 0 < diff then min * 2
                  else min * 2 - 1
    in
        print (Int.toString ans ^ "\n")
    end