Two wires as shown in the figure below, made of steel and have breaking stress of $12 \times 10^3 \mathrm{~N} / \mathrm{m}^2$. Area of cross-section of upper wire is $0.008 \mathrm{~cm}^2$ and of lower wire is $0.004 \mathrm{~cm}^2$. The maximum mass that can be added to pan without breaking any wire is $\_\_\_\_$ kg. (Take $\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$ )