For a set of five points in the plane, no three of them being collinear, let be the numbers of acute triangles formed by vertices in . Find the maximum value of over all such sets .
%V0
For a set $P$ of five points in the plane, no three of them being collinear, let $s(P)$ be the numbers of acute triangles formed by vertices in $P$.
Find the maximum value of $s(P)$ over all such sets $P$.
Izvor: Srednjoeuropska matematička olimpijada 2007, ekipno natjecanje, problem 6
Školjka 
of five points in the plane, no three of them being collinear, let 
be the numbers of acute triangles formed by vertices in