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diff --git a/challenge-306/barroff/raku/ch-1.p6 b/challenge-306/barroff/raku/ch-1.p6
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+++ b/challenge-306/barroff/raku/ch-1.p6
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+#!/usr/bin/env raku
+
+use v6.d;
+
+sub sum-n-slices(@ints, Int $n --> Int) {
+    sum(
+        map(
+            {
+                @ints[$_ - 1] ×
+                min($n, $_, @ints.elems + 1 - $_, @ints.elems + 1 - $n)
+            },
+            1..@ints.elems
+        )
+    )
+}
+
+sub odd-sum(@ints --> Int) {
+    sum(
+        map(
+            { $_ %% 2 ?? 0 !! sum-n-slices(@ints, $_) },
+            1..@ints.elems
+        )
+    )
+}
+
+#| Run test cases
+multi sub MAIN('test') {
+    use Test;
+    plan 2;
+
+    is odd-sum([2, 5, 3, 6, 4]), 77, 'works for [2, 5, 3, 6, 4]';
+    is odd-sum([1, 3]), 4, 'works for [1, 3]';
+}
+
+#| Take user provided number like 1 0 1
+multi sub MAIN(*@ints) {
+    say odd-sum(@ints);
+}