To explicate the wisdom offered above:

You were lead to believe that you could get the number of arguments and the arguments with the following:

my ($argCount, @argValues) = @_;
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Unfortunately, you were misled. Someone confused Perl with the way a C main() routine gets its arguments from the command line.

Perl gets its subroutine arguments passed in the @_ array. So, to get the argument values for your subroutine, do this:

my (@arguments) = @_;
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To get the number of items in a perl array, call it in a scalar context. So:

my (@arguments) = @_;
my $argument_count = scalar(@arguments);
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No separate $argumentCount variable is needed, since Perl arrays know their own lengths.

Good luck. We're all counting on you.