diff --git a/codewars/7kyu/billiards-triangle/koronya.js b/codewars/7kyu/billiards-triangle/koronya.js
new file mode 100644
index 000000000..bf46e8846
--- /dev/null
+++ b/codewars/7kyu/billiards-triangle/koronya.js
@@ -0,0 +1,14 @@
+// [JS][7kyu] Billiards triangle
+// billiards-triangle
+// https://www.codewars.com/kata/5bb3e299484fcd5dbb002912/train/javascript
+
+const pyramid = (balls) => {
+  const result = (-1 + Math.sqrt(1 + 8 * balls)) / 2
+  return Math.floor(result)
+}
+
+pyramid(1) === 1
+pyramid(4) === 2
+pyramid(20) === 5
+pyramid(100) === 13
+pyramid(9999) === 140