Two elements A and B have following electronic configuration

$\begin{array}{l}\mathrm{A}=1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}4{\mathrm{s}}^2\\ \mathrm{B}=1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^3\end{array}$

$\text{ It is expected that they form a compound }{A}_x{B}_y\text{ then sum of }x\text{ and }y\text{ is : }$(Ignore charge only observe the value)