How many washers of three different sizes can I fit onto a rod 3.873 in long?

I have a bar 3.873 in. long. I must slide as many washers as possible onto it, leaving the least amount of space. The three thicknesses of the washers are .213 in, .207 in, .204 in. How many of each thickness do I use and how do I model the equations.How many washers of three different sizes can I fit onto a rod 3.873 in long?
If your goal is to maximize the number of washers on the rod, then it makes sense to only add washers of the smallest thickness. So keep adding the 0.204 inch washers. Divide 3.873 by 0.204 and drop the remainder to see how many of these you can fit.How many washers of three different sizes can I fit onto a rod 3.873 in long?
I don't see the aim is to put on as many washers as possible but to leave as little space as possible. To do that I cant see how to do it better than 18 of the .213'; washers, leaving .039'; spare.

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