open System
open System.Numerics

// prelude
let readStr () = stdin.ReadLine()

let read f () = readStr() |> f
let reads f () = readStr().Split() |> Array.map f

let pair = function
| [|a; b|] -> (a, b)
| _ -> failwith "owatta"

let triple = function
| [|a; b; c|] -> (a, b, c)
| _ -> failwith "owatta"

let readPair f g () =
  let (a,b) = readStr().Split() |> pair
  (f a, g b)

let readTriple f g h () =
  let (a,b,c) = readStr().Split() |> triple
  (f a, g b, h c)

let inc n = n + 1
let dec n = n - 1

let inline flip f a b = f b a
let rec fix f = fun x -> (f (fix f)) x

module Option =
  let getOr defaultValue = function
  | Some x -> x
  | None -> defaultValue

module Array =
  let modify (arr: _ []) i f =
    arr.[i] <- f arr.[i]

module Array2D =
  let modify (arr: _ [,]) i j f =
    arr.[i, j] <- f arr.[i, j]

// start
let (A,B) = readPair int64 string ()

let B0 = int64 (B.[0..0])
let B1 = int64 (B.[2..2])
let B2 = int64 (B.[3..3])

let tmp = (A*B1) + (A*B2/10L)
(A*B0) + (tmp/10L)
|> printfn "%d"