\[\boxed{\text{450\ (450).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[= \sqrt{2 + \sqrt{3}} \cdot \sqrt{4 - 2 - \sqrt{3}} =\]
\[\sqrt{\left( 2 + \sqrt{3} \right)\left( 2 - \sqrt{3} \right)} = \sqrt{4 - 3} =\]
\[= \sqrt{1} = 1.\]