diff --git "a/JHLEE325/202602/20 BOJ G5 \353\213\244\354\235\264\354\226\264\355\212\270.md" "b/JHLEE325/202602/20 BOJ G5 \353\213\244\354\235\264\354\226\264\355\212\270.md"
new file mode 100644
index 00000000..e87be229
--- /dev/null
+++ "b/JHLEE325/202602/20 BOJ G5 \353\213\244\354\235\264\354\226\264\355\212\270.md"	
@@ -0,0 +1,38 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int G = Integer.parseInt(br.readLine());
+
+        long low = 1;
+        long high = 2;
+        boolean found = false;
+        StringBuilder sb = new StringBuilder();
+
+        while (true) {
+            long diff = high * high - low * low;
+
+            if (high - low == 1 && diff > G) break;
+
+            if (diff == G) {
+                sb.append(high).append("\n");
+                found = true;
+                high++;
+            } else if (diff < G) {
+                high++;
+            } else {
+                low++;
+            }
+        }
+
+        if (!found) {
+            System.out.println(-1);
+        } else {
+            System.out.print(sb.toString());
+        }
+    }
+}
+```