diff --git a/zeta_cpp/completed/15964.cpp b/zeta_cpp/completed/15964.cpp
new file mode 100644
index 0000000..a28d57c
--- /dev/null
+++ b/zeta_cpp/completed/15964.cpp
@@ -0,0 +1,11 @@
+#include <iostream>
+
+using namespace std;
+
+int main() {
+    long long A, B;
+    cin >> A >> B;
+    cout << A * A - B * B;
+
+    return 0;
+}
\ No newline at end of file