$$0+ \frac{ 1 }{ 2 } \times 4 \times 10 \times 4 \times 10$$
$800$
$$0+\frac{4}{2}\times 10\times 4\times 10$$
$$0+2\times 10\times 4\times 10$$
$$0+20\times 4\times 10$$
$$0+80\times 10$$
$$0+800$$
$$800$$
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$2^{5}\times 5^{2}$
