diff --git "a/lkhyun/202509/13 BOJ G4 \355\214\200 \353\271\214\353\224\251.md" "b/lkhyun/202509/13 BOJ G4 \355\214\200 \353\271\214\353\224\251.md"
new file mode 100644
index 00000000..4fee5edf
--- /dev/null
+++ "b/lkhyun/202509/13 BOJ G4 \355\214\200 \353\271\214\353\224\251.md"	
@@ -0,0 +1,37 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    static StringTokenizer st;
+    static int N;
+    static int[] arr;
+
+    public static void main(String[] args) throws IOException {
+        N = Integer.parseInt(br.readLine());
+        arr = new int[N];
+
+        st = new StringTokenizer(br.readLine());
+        for (int i = 0; i < N; i++) {
+            arr[i] = Integer.parseInt(st.nextToken());
+        }
+        int left = 0;
+        int right = N-1;
+        int ans = 0;
+        while(left < right){           
+            if(arr[left] <= arr[right]){
+                ans = Math.max(ans,(right-left-1)*arr[left]);
+                left++;
+            }else{
+                ans = Math.max(ans,(right-left-1)*arr[right]);
+                right--;
+            }
+        }
+        bw.write(ans+"");
+        bw.close();
+    }
+}
+```