  We explain how to recover the top level of a cohomological G-Mackey functor
$\underline{M}$ from the restriction of $\underline{M}$ to each of the Sylow
subgroups of G.
  As an application, we compute the Mackey functor valued G-equivariant
homology groups of a point with constant $\mathbb{Z}$-coefficients when G has
order pq for odd primes p<q. We also indicate how the calculation goes for
$G=A_4$.
