3. A lattice point is a point \( (x, y) \) in the plane, both of whose coordinates are integers. It is easy to see that every lattice point can be surrounded by a small circle which excludes all other lattice points from its interior. It is not much harder to see that it is possible to draw a circle which has exactly two lattice points in its interior, or exactly 3 , or exactly 4 , as shown in the picture below. Do you think that for every positive integer \( n \) there is a circle in the plane which contains exactly \( n \) lattice points in its interior? Justify your answer.
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