  First physics results of the BM@N experiment at the Nuclotron/NICA complex
are presented on {\pi}+ and K+ meson production in interactions of an argon
beam with fixed targets of C, Al, Cu, Sn and Pb at 3.2 AGeV. Transverse
momentum distributions, rapidity spectra and multiplicities of $\pi^+$ and
$K^+$ mesons are measured. The results are compared with predictions of
theoretical models and with other measurements at lower energies.
