$\=$/;$/=$];$_=<>;s/mod/%/;s' 0 /');$_.=("\nERR"';s' ');print; 'g;s'^| ');push@ARGV,($_='gm;s.[-%+^*/].(\$_=pop,(pop)$&\$_).g;s/^\)//gm;s/\^/**/;eval
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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