$$2+1+2\times1^{2}-1^{3}$$
$4$
$$3+2\times 1^{2}-1^{3}$$
$$3+2\times 1-1^{3}$$
$$3+2-1^{3}$$
$$5-1^{3}$$
$$5-1$$
$$4$$
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$2^{2}$
