  We calculate four-point correlation functions of two weight-2 and two
weight-3 1/2-BPS operators in \mathcal{N}=4 SYM in the large N limit in
supergravity approximation. By the AdS/CFT conjecture, these operators are dual
to AdS supergravity scalar fields s_2 and s_3 with mass m^2 = -4 and m^2 = -3
respectively. This is the first non-trivial four-point function of mixed-weight
operators of lowest conformal dimensions.
  We show that the supergravity-induced four-point function splits into a
"free" and a "quantum" part, where the quantum contribution obeys non-trivial
constraints coming from the insertion procedure in the gauge theory, in
particular, it depends on only one function of the conformal cross-ratios.
