A,B=gets.split.map(&:to_i)
(1..1000).each{|sum|
    (0..sum).each{|a|
        b = sum - a
        ap = ((200*a + sum)/(sum*2))
        bp = ((200*b + sum)/(sum*2))
        if ap == A && bp == B
            puts sum
            exit 0
        end
    }
}