diff --git "a/lkhyun/202509/18 BOJ G4 \353\246\254\353\252\250\354\273\250.md" "b/lkhyun/202509/18 BOJ G4 \353\246\254\353\252\250\354\273\250.md"
new file mode 100644
index 00000000..52490d9a
--- /dev/null
+++ "b/lkhyun/202509/18 BOJ G4 \353\246\254\353\252\250\354\273\250.md"	
@@ -0,0 +1,56 @@
+```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, M;
+    static boolean[] broken = new boolean[10];
+    
+    public static void main(String[] args) throws IOException {
+        N = Integer.parseInt(br.readLine());
+        M = Integer.parseInt(br.readLine());
+        if(M!=0){
+            st = new StringTokenizer(br.readLine());
+        for (int i = 0; i < M; i++) {
+            broken[Integer.parseInt(st.nextToken())] = true;
+        }
+        }
+        
+        int result = Math.abs(N - 100);
+        
+        for (int channel = 0; channel <= 1000000; channel++) {
+            int cnt = getCount(channel);
+            if (cnt > 0) {
+                int total = cnt + Math.abs(N - channel);
+                result = Math.min(result, total);
+            }
+        }
+        
+        bw.write(result+"");
+        bw.close();
+    }
+    
+    static int getCount(int channel) {
+        if (channel == 0) {
+            return broken[0] ? -1 : 1;
+        }
+        
+        int count = 0;
+        int temp = channel;
+        
+        while (temp > 0) {
+            int digit = temp % 10;
+            if (broken[digit]) {
+                return -1;
+            }
+            count++;
+            temp /= 10;
+        }
+        
+        return count;
+    }
+}
+```