diff --git "a/khj20006/202509/13 BOJ G4 \355\214\200 \353\271\214\353\224\251.md" "b/khj20006/202509/13 BOJ G4 \355\214\200 \353\271\214\353\224\251.md"
new file mode 100644
index 00000000..ad76ae39
--- /dev/null
+++ "b/khj20006/202509/13 BOJ G4 \355\214\200 \353\271\214\353\224\251.md"	
@@ -0,0 +1,86 @@
+```java
+import java.io.*;
+import java.util.*;
+
+class IOController {
+	BufferedReader br;
+	BufferedWriter bw;
+	StringTokenizer st;
+
+	public IOController() {
+		br = new BufferedReader(new InputStreamReader(System.in));
+		bw = new BufferedWriter(new OutputStreamWriter(System.out));
+		st = new StringTokenizer("");
+	}
+
+	String nextLine() throws Exception {
+		String line = br.readLine();
+		st = new StringTokenizer(line);
+		return line;
+	}
+
+	String nextToken() throws Exception {
+		while (!st.hasMoreTokens())
+			nextLine();
+		return st.nextToken();
+	}
+
+	int nextInt() throws Exception {
+		return Integer.parseInt(nextToken());
+	}
+
+	long nextLong() throws Exception {
+		return Long.parseLong(nextToken());
+	}
+
+	double nextDouble() throws Exception {
+		return Double.parseDouble(nextToken());
+	}
+
+	void close() throws Exception {
+		bw.flush();
+		bw.close();
+	}
+
+	void write(String content) throws Exception {
+		bw.write(content);
+	}
+
+}
+
+public class Main {
+
+	static IOController io;
+
+	//
+
+	static int N;
+	static int[] min, max;
+
+	public static void main(String[] args) throws Exception {
+
+		io = new IOController();
+
+		N = io.nextInt();
+		min = new int[10001];
+		max = new int[10001];
+		for(int i=1;i<=N;i++) {
+			int a = io.nextInt();
+			if(min[a] == 0) min[a] = i;
+			max[a] = i;
+		}
+
+		int ans = 0;
+		for(int i=1;i<=10000;i++) for(int j=1;j<=10000;j++) {
+			if(max[i] == 0 || max[j] == 0 || max[j] == min[i]) continue;
+			ans = Math.max(ans, Math.min(i,j) * (max[j] - min[i] - 1));
+		}
+
+		io.write(ans + "\n");
+
+		io.close();
+
+	}
+
+}
+```