diff --git a/2201/220115-CN.cpp b/2201/220115-CN.cpp
new file mode 100644
index 0000000..2f90b01
--- /dev/null
+++ b/2201/220115-CN.cpp
@@ -0,0 +1,13 @@
+#include <iostream>
+
+class Solution {
+public:
+	static auto totalMoney(auto n) {
+		return (28 + n % 7) * (n / 7) + (n / 7) * (n / 7 - 1) / 2 * 7 + (1 + n % 7) * (n % 7) / 2;
+	}
+};
+
+int main() {
+	std::cout << Solution::totalMoney(20);
+	return 0;
+}
\ No newline at end of file
diff --git a/2201/CMakeLists.txt b/2201/CMakeLists.txt
index 27aa1d8..7afa65b 100644
--- a/2201/CMakeLists.txt
+++ b/2201/CMakeLists.txt
@@ -3,4 +3,4 @@ PROJECT(2201)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2201 220114-CN.cpp)
\ No newline at end of file
+ADD_EXECUTABLE(2201 220115-CN.cpp)
\ No newline at end of file