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


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

        val period = (31 - a) + b

        val ans = if c <= period then "1"
                  else if d <= period then "2"
                  else "3"
    in
        print (ans ^ "\n")
    end