Consider the following reaction

$\mathrm{MnO}_2+\mathrm{KOH}+\mathrm{O}_2 \rightarrow \mathrm{A}+\mathrm{H}_2 \mathrm{O} \text {. }$

Product '$\mathrm{A}$' in neutral or acidic medium disproportionate to give products '$\mathrm{B}$' and '$\mathrm{C}$' along with water. The sum of spin-only magnetic moment values of $\mathrm{B}$ and $\mathrm{C}$ is ________ BM. (nearest integer) (Given atomic number of $\mathrm{Mn}$ is 25)