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Return how many Hexagonal Tiling grid points there are inside a circle of radius *r* centred at (0,0) (including points on the edge). Assume that a Hexagonal Tiling grid is a 2D Regular Hexagonal Tessellation with equal edges of size *e*=1.

For *shifted* symmetry purposes, assume that (0,0) is a *grid point*.

Neither **string operations** nor **interpolations** are allowed!

8 correct solutions
2 incorrect solutions

Last solution submitted on May 21, 2015