There are $$$n$$$ children who want to go to a Ferris wheel, and your task is to find a gondola for each child.
Each gondola may have one or two children in it, and in addition, the total weight in a gondola may not exceed $$$x$$$. You know the weight of every child.
What is the minimum number of gondolas needed for the children?
The first input line contains two integers $$$n$$$ and $$$x$$$: the number of children and the maximum allowed weight.
The next line contains $$$n$$$ integers $$$p_1,p_2,\dots,p_n$$$: the weight of each child.
Constraints:
Print one integer: the minimum number of gondolas.
4 10 7 2 3 9
3
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