def fib(a:int)
  if a < 2
    a
  else
    fib(a - 1) + fib(a - 2)
  end
end

def bench(n:int)
  n.times do
    time_start = System.currentTimeMillis
    puts "fib(45): #{fib(45)}\nTotal time: #{System.currentTimeMillis - time_start}"
  end
end

bench 10