1 files changed, 10 insertions, 0 deletions
diff --git a/triangle.hgn b/triangle.hgn
new file mode 100644
index 0000000..5459c12
--- /dev/null
+++ b/triangle.hgn
@@ -0,0 +1,10 @@
+main := proc() {
+    n := read_int(0)
+    print(triangle(n))
+    exit(0)
+}
+
+triangle := proc(n) {
+    if n == 0 { return 0 }
+    return triangle(n - 1) + n
+}