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diff --git a/challenge-261/jo-37/perl/ch-1.pl b/challenge-261/jo-37/perl/ch-1.pl
new file mode 100755
index 0000000000..976d0f9318
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+++ b/challenge-261/jo-37/perl/ch-1.pl
@@ -0,0 +1,65 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0;
+use warnings FATAL => 'all';
+use Math::Prime::Util qw(vecreduce vecsum todigits);
+use Data::Dump qw(dd pp);
+use experimental 'signatures';
+
+our ($tests, $examples, $base);
+$base ||= 10;
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [-base=BASE] [N...]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+-base=BASE
+    use BASE for number representation. Default: 10
+
+N...
+    list of numbers
+
+EOS
+
+
+### Input and Output
+
+say eds($base, @ARGV);
+
+
+### Implementation
+
+sub eds ($base, @ints) {
+	vecreduce {$a + $b - vecsum todigits $b, $base} 0, @ints;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is eds(10 ,=> 1, 2, 3, 45), 36, 'example 1';
+        is eds(10 ,=> 1, 12, 3), 9, 'example 2';
+        is eds(10 ,=> 1, 2, 3, 4), 0, 'example 3';
+        is eds(10 ,=> 236, 416, 336, 350), 1296, 'example 4';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+
+        is eds(2 ,=> 3, 4), 4, '0b11, 0b100';
+	}
+
+    done_testing;
+    exit;
+}