A right triangular wooden block of mass M=4 kg is at rest on a smooth table as shown in the figure. Two smaller wooden cubes both of mass m=2 kg, initially at rest on the two sides of the larger block start sliding down. What is the normal force (in newton) applied by the system on the table?  $(\mathrm{Take}\mathrm{g}=9.8\mathrm{m}/{\mathrm{s}}^2)$