You want to roast a few toasts for the upcoming party. There is a frying pan, that can roast at the same time toasts. Roasting the toast from one side takes minutes. We assume that placing a toast into a frying pan, turning and removing it from the pan performed instantly. Write a program that computes the minimum time in minutes for roasting toasts. Toasts should not be removed from the pan sooner or later that minutes required for toasting one side. Each toast should be roasted from both sides.
The first line contains two integers and — the number of toasts and pan capacity.
Print the minimum time in minutes required to roast toasts.