You're missing a semicolon on the line my $sum = $fred * $barney.
Update: Also, note that since return will return from the sub, the if won't get executed. And I'm not sure why your if blocks only have one variable in them - if you're trying to return either one or the other value, don't use an if, use the Conditional Operator ?:, as in ( $fred > $barney ? $fred : $barney ).
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