Let $C$ be a fixed unit circle in the Cartesian plane. For any convex polygon $P$ each of whose sides is tangent to $C$. let $N(P, h, k)$ be the number of points common to $P$ and the unit circle with center at ( $h, k$ ). Let $H(P)$ be the region of all points $(x, y)$ for which $N(P, x, y) \geq 1$ and $F(P)$ be the area of $H(P)$. Find the smallest number $u$ with
$$
\frac{1}{F(P)} \iint N(P, x, y) d x d y<u
$$
for all polygons $P$, where the double integral is taken over $H(P)$.The answer is in the form \frac{m}{n}, where gcd(m, n) = 1. Please provide the value of m + n.

Let's think step by step and output the final answer within \boxed{}.
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