**Complete to solve $63 + 427$.**
$\phantom{=}63+427$
$=(60+$ [[☃ input-number 1]]$)+ 427$
$=60 + ($[[☃ input-number 2]] $+ 427)$
$=60 + $ [[☃ input-number 3]]
$=$ [[☃ input-number 4]]
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