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C:\test>p1
use List::Util qw[ sum ];;
...

print sum map{ $_ > 1 ? $_ - 1 : () } values %seen;;
13

@selected_data = qw(13 76 90 13 77 100 76 300 13 65 400 74 89 34 65);
@all_data = qw(1 5 2 8 12 87 13 76 98 77 89 90 11 65 43 74 43 32 34 67
+);
...

print $count;;
12