-- yukicoder My Practice
-- author: Leonardone @ NEETSDKASU

main = print . solve . map read . words =<< getLine where
    calc x z = (5 + 1000 * x `div` z) `div` 10
    solve [a, b] = minimum
        [ x + y
        | x <- [0..100]
        , y <- [0..100]
        , let z = x + y
        , z > 0
        , let x1 = calc x z
        , let y1 = calc y z
        , x1 == a && y1 == b]