diff --git "a/LiiNi-coder/202602/17 BOJ \353\213\244\354\235\264\354\226\264\355\212\270.md" "b/LiiNi-coder/202602/17 BOJ \353\213\244\354\235\264\354\226\264\355\212\270.md"
new file mode 100644
index 00000000..b51f179a
--- /dev/null
+++ "b/LiiNi-coder/202602/17 BOJ \353\213\244\354\235\264\354\226\264\355\212\270.md"	
@@ -0,0 +1,34 @@
+```java
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+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 old = 1;
+		long now = 2;
+		boolean isFind = false;
+
+		while (now <= 100000 && old < now) {
+			long diff = now * now - old * old;
+			if (diff == G) {
+				System.out.println(now);
+				isFind = true;
+				old++;
+			} else if (diff < G) {
+				now++;
+			} else {
+				old++;
+			}
+		}
+
+		
+		if (!isFind) {
+			System.out.println(-1);
+		}
+	}
+}
+
+```