defmodule Main do
  def main do
    l = IO.gets("") |> String.trim |> String.to_integer
    m = IO.gets("") |> String.trim |> String.to_integer
    n = IO.gets("") |> String.trim |> String.to_integer
    ex_l = div(l, 25)
    ex_m = div(ex_l+m, 4) 
    ex_n = div(ex_m+n, 10)
    (l - ex_l) + (m - ex_m) + (n - ex_n) |> IO.puts
  end
  
  def exchange(from, to) do
    div(from, to)
  end
end