diff --git a/cpp/2204/220405-CN.cpp b/cpp/2204/220405-CN.cpp
new file mode 100644
index 0000000..c9a982a
--- /dev/null
+++ b/cpp/2204/220405-CN.cpp
@@ -0,0 +1,22 @@
+#include <iostream>
+
+class Solution {
+private:
+	static inline const int IS_PRIME[32] = {0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1};
+public:
+	static int countPrimeSetBits(int left, int right) {
+		int ret = 0;
+		for (int i = left; i <= right; ++i) {
+			int x = 0;
+			for (int n = i; n; n >>= 1)
+				x += n & 1;
+			ret += IS_PRIME[x];
+		}
+		return ret;
+	}
+};
+
+int main() {
+	std::printf("%d\n", Solution::countPrimeSetBits(6, 10));
+	return 0;
+}
diff --git a/cpp/2204/CMakeLists.txt b/cpp/2204/CMakeLists.txt
index 2779ee4..eccaf53 100644
--- a/cpp/2204/CMakeLists.txt
+++ b/cpp/2204/CMakeLists.txt
@@ -3,4 +3,4 @@ PROJECT(2204)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2204 220406.cpp)
+ADD_EXECUTABLE(2204 220405-CN.cpp)