defmodule Main do
    def shuffle(cards, []), do: cards
    def shuffle(cards, orders) do
        [n | orders] = orders
        cards = cards |> List.pop_at(n - 1) |> (fn {x, y} -> [x] ++ y end).()
        shuffle(cards, orders)
    end
    def main do

        inputs = IO.binread(:all) |> String.split

        [n, _ | as] = inputs |> Enum.map(&String.to_integer/1)

        IO.puts shuffle(Enum.to_list(1..n), as) |> List.first

    end
end