$$360 \times [ 475 - \{ 440 - ( 150 - 60 - 50 ) + 20 \} - 50 ]$$
$1800$
$$360\left(475-\left(440-\left(90-50\right)+20\right)-50\right)$$
$$360\left(475-\left(440-40+20\right)-50\right)$$
$$360\left(475-\left(400+20\right)-50\right)$$
$$360\left(475-420-50\right)$$
$$360\left(55-50\right)$$
$$360\times 5$$
$$1800$$
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$2^{3}\times 3^{2}\times 5^{2}$
