let pow x n =
  let rec doit x n acc =
    if n = 0 then acc
    else doit (x * x) (n / 2) (if n mod 2 = 0 then acc else acc * x) in
  doit x n 1

let () =
  let l, n = Scanf.scanf "%d %d " (fun l n -> l, n) in
  Printf.printf "%d\n" (n * pow 2 (l - 3))