for (<>) {
     chomp;
    /(\d+)\s+(\d+)/ or next;
    $total{$1} += $2;
}
for (sort { <=> } keys %total) {
     print "$_ = $total{$_}\n";
}

##</code><code>##

-- 
Joost       downtime n. The period during which a system
            is error-free and immune from user input.