diff --git "a/LiiNi-coder/202510/21 PGM \353\213\244\354\235\214 \355\201\260 \354\210\253\354\236\220.md" "b/LiiNi-coder/202510/21 PGM \353\213\244\354\235\214 \355\201\260 \354\210\253\354\236\220.md"
new file mode 100644
index 00000000..878d56a4
--- /dev/null
+++ "b/LiiNi-coder/202510/21 PGM \353\213\244\354\235\214 \355\201\260 \354\210\253\354\236\220.md"	
@@ -0,0 +1,24 @@
+```java
+class Solution {
+    public int solution(int n) {
+        int answer = 0;
+        int i = n+1;
+        int n1 = get1OfBinary(n);
+        while(get1OfBinary(i) != n1){
+            i++;
+        }
+        return i;
+    }
+    public static int get1OfBinary(int n){
+        int result = 0;
+        while(n>1){
+            result += n%2;
+            n/=2;
+        }
+        if(n==1){
+            result++;
+        }
+        return result;
+    }
+}
+```