use warnings;
use strict;

my $i = $#ARGV;                             #Scalar for array length

if ($ARGV[0] eq "add") {                    #Checks for add
	my $rtn = add(@ARGV[1..$i]);     #Calls add subroutine
	print "The sum is: $rtn";
}

elsif ($ARGV[0] eq "multiply"){                    #Checks for multiply
	my $rtn = multiply(@ARGV[1..$i]);       #Calls multiply subroutine
	print "Their product is: $rtn";
}

sub add {                            #add subroutine
	my ($sum);
	$sum=0;
	foreach $_(@_) {                 #Loops through the array
		$sum +=$_;                   #Adds each array element to the rest
	}
	return $sum;                     #Returns the sum value
}

sub multiply {                       #multiply subroutine
	my $product=1;                   
	foreach $_(@_) {                 #Loops through the array
		$product*=$_;                #Multiplys each element to last
	}
	return $product;                 #Returns the product value
}