diff --git "a/suyeun84/202506/30 BOJ G4 \354\235\214\354\213\235 \355\217\211\353\241\240\352\260\200.md" "b/suyeun84/202506/30 BOJ G4 \354\235\214\354\213\235 \355\217\211\353\241\240\352\260\200.md"
new file mode 100644
index 00000000..125b6bc3
--- /dev/null
+++ "b/suyeun84/202506/30 BOJ G4 \354\235\214\354\213\235 \355\217\211\353\241\240\352\260\200.md"	
@@ -0,0 +1,25 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class boj1188 {
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static StringTokenizer st;
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+	
+	public static void main(String[] args) throws Exception {
+		nextLine();
+		int N = nextInt();
+		int M = nextInt();
+		
+		int div = M;
+		while(div > 0) {
+			int temp = N;
+			N = div;
+			div = temp % div;
+		}
+		System.out.println(M - N);
+	}
+}
+```