Among $$\mathrm{CrO}, \mathrm{Cr}_2 \mathrm{O}_3$$ and $$\mathrm{CrO}_3$$, the sum of spin-only magnetic moment values of basic and amphoteric oxides is ________ $$10^{-2} \mathrm{BM}$$ (nearest integer). (Given atomic number of $$\mathrm{Cr}$$ is 24)