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diff --git a/challenge-089/walt-mankowski/perl/ch-1.pl b/challenge-089/walt-mankowski/perl/ch-1.pl
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+#!/usr/bin/env perl
+use strict;
+use warnings;
+use feature qw(:5.32);
+use experimental qw(signatures);
+
+# TASK #1 › GCD Sum
+# Submitted by: Mohammad S Anwar
+#
+# You are given a positive integer $N.
+#
+# Write a script to sum GCD of all possible unique pairs between 1 and $N.
+
+sub gcd($a, $b) {
+    return $b == 0 ? $a : gcd($b, $a % $b);
+}
+
+my $n = $ARGV[0];
+my $sum = 0;
+for my $i (1..$n-1) {
+    for my $j ($i+1..$n) {
+        $sum += gcd($j, $i);
+    }
+}
+
+say $sum;