diff --git "a/khj20006/202506/18 BOJ P5 \354\203\201\353\202\250\354\236\220 \352\263\275\354\262\240\354\232\251.md" "b/khj20006/202506/18 BOJ P5 \354\203\201\353\202\250\354\236\220 \352\263\275\354\262\240\354\232\251.md"
new file mode 100644
index 00000000..c2e6c339
--- /dev/null
+++ "b/khj20006/202506/18 BOJ P5 \354\203\201\353\202\250\354\236\220 \352\263\275\354\262\240\354\232\251.md"	
@@ -0,0 +1,111 @@
+```java
+import java.math.BigInteger;
+import java.util.*;
+import java.io.*;
+
+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, M, K, base;
+    static List<Integer> A;
+
+    public static void main(String[] args) throws Exception {
+
+        io = new IOController();
+
+        init();
+        solve();
+
+        io.close();
+
+    }
+
+    public static void init() throws Exception {
+
+        N = io.nextInt();
+        M = io.nextInt();
+        K = io.nextInt();
+
+        boolean[] ex = new boolean[4*N+1];
+        for(int i=0;i<M;i++) {
+            ex[io.nextInt()] = true;
+            ex[io.nextInt()] = true;
+        }
+
+        int a = io.nextInt(), b = io.nextInt();
+        ex[a] = true;
+        ex[b] = true;
+        base = Math.abs((a%K) - (b%K));
+
+        A = new ArrayList<>();
+        for(int i=1;i<=4*N;i++) if(!ex[i]) A.add(i%K);
+
+    }
+
+    static void solve() throws Exception {
+
+        Collections.sort(A);
+        int e = A.size() - 1, s = A.size()/2, ans = 0;
+        while(s >= 0) {
+            int a = A.get(e), b = A.get(s);
+            if(a-b > base) {
+                e--;
+                ans++;
+            }
+            s--;
+        }
+        io.write(Math.min(ans, M-1) + "\n");
+
+
+    }
+
+}
+```