diff --git a/boj/solved/divide_conquer/18222/Main.java b/boj/solved/divide_conquer/18222/Main.java
new file mode 100644
index 0000000..1f4957c
--- /dev/null
+++ b/boj/solved/divide_conquer/18222/Main.java
@@ -0,0 +1,34 @@
+import java.io.*;
+import java.util.*;
+
+class Main {
+    static long n;
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        n = Long.parseLong(br.readLine());
+
+        long size = 1;
+        while(size < n) {
+            size *= 2;
+        }
+        
+        int reverseCount = 0;
+        while(size > 1) {
+            long tmp = size/2;
+            if(tmp < n) { // 오른쪽에 있을 경우
+                size -= tmp;
+                n -= tmp;
+                reverseCount +=1;
+            }
+            else {
+                size -= tmp;
+            }
+        }
+        
+        System.out.println(reverseCount % 2);
+    }
+}
+// 01101001 10010110
+// 12 16 -> 4 8 -> 4 4 -> 2 2 -> 1 1
+// r r r
+// 반으로 나눴을때 오른쪽에 있으면 reverse 왼쪽은 그대로
\ No newline at end of file