From 0527e2a230cc76ae4fdd51881c69ce6fbf04d91c Mon Sep 17 00:00:00 2001
From: sieunnnn <wldsmtldsm65@gmail.com>
Date: Fri, 13 Oct 2023 16:45:19 +0900
Subject: [PATCH] =?UTF-8?q?=EB=B0=B1=EC=A4=80/=EB=8B=A8=EA=B3=84=EB=B3=84:?=
 =?UTF-8?q?=2015439=20=EB=B2=A0=EB=9D=BC=EC=9D=98=20=ED=8C=A8=EC=85=98=20(?=
 =?UTF-8?q?#23)?=
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---
 src/baekjoon/step/combinatoric/PROB15439.java | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 src/baekjoon/step/combinatoric/PROB15439.java

diff --git a/src/baekjoon/step/combinatoric/PROB15439.java b/src/baekjoon/step/combinatoric/PROB15439.java
new file mode 100644
index 0000000..ccd5495
--- /dev/null
+++ b/src/baekjoon/step/combinatoric/PROB15439.java
@@ -0,0 +1,24 @@
+package baekjoon.step.combinatoric;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class PROB15439 {
+
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static int N;
+    static int cnt;
+
+    public static void main(String[] args) throws IOException {
+        N = Integer.parseInt(br.readLine());
+
+        for (int i = 0; i < N; i ++) {
+            for (int j = i + 1; j < N; j ++) {
+                cnt ++;
+            }
+        }
+
+        System.out.println(cnt * 2);
+    }
+}