class Hoe

def timebomb n, m, finis = nil, start = nil
  require "time"
  finis = Time.parse(finis || "#{Time.now.year}-12-31")
  start = Time.parse(start || "#{Time.now.year}-01-01")
  rest  = (finis - Time.now)
  full  = (finis - start)
  [((n - m) * rest / full).to_i + m, m].max
end