I just counted the possible ways of solving the problem.
Since the objects and the boxes are indistinguishables, the only possible ways are
5 0 0
4 1 0
3 2 0
3 1 1
2 2 1
The answer is therefore 5

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Ph.D. on Applied Mathematics in Aug 2007. Involved on applications of image super-resolution to electron microscopy

Francisco Blanco-Silva