**Complete to solve $37+ 13$.**
$\phantom{=}37+13$
$=(30+$ [[☃ input-number 1]]$)+ 13$
$=30 + ($[[☃ input-number 2]] $+ 13)$
$=30 + $ [[☃ input-number 3]]
$=$ [[☃ input-number 4]]
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