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diff --git a/challenge-271/jo-37/perl/ch-1.pl b/challenge-271/jo-37/perl/ch-1.pl
new file mode 100755
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+++ b/challenge-271/jo-37/perl/ch-1.pl
@@ -0,0 +1,59 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0 '!float';
+use PDL;
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [M]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+M
+    a matrix as accepted by the PDL constructor, e.g. '1, 0; 0, 1'
+
+EOS
+
+
+### Input and Output
+
+say maximum_ones(@ARGV);
+
+
+### Implementation
+#
+# For details see:
+# https://github.sommrey.de/the-bears-den/2024/05/31/ch-271.html#task-1
+
+
+sub maximum_ones {
+    1 + maximum_ind sumover pdl @_;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is maximum_ones([[0, 1], [1, 0]]), 1, 'example 1';
+        is maximum_ones([[0, 0, 0], [1, 0, 1]]), 2, 'example 2';
+        is maximum_ones([[0, 0], [1, 1], [0, 0]]), 2, 'example 3';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}