$$42+ \sqrt{ 1 \sqrt{ 3 \sqrt{ 0 } } }$$
$42$
$$42+\sqrt{1\sqrt{3\times 0}}$$
$$42+\sqrt{1\sqrt{0}}$$
$$42+\sqrt{1\times 0}$$
$$42+\sqrt{0}$$
$$42+0$$
$$42$$
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$2\times 3\times 7$