diff --git a/GESP/GESP C++三级认证试卷2023年6月.pdf b/GESP/GESP C++三级认证试卷2023年6月.pdf
index 1fcccb9..04ecc9d 100644
Binary files a/GESP/GESP C++三级认证试卷2023年6月.pdf and b/GESP/GESP C++三级认证试卷2023年6月.pdf differ
diff --git a/TangDou/51NOD/Test.cpp b/TangDou/51NOD/Test.cpp
new file mode 100644
index 0000000..abb7659
--- /dev/null
+++ b/TangDou/51NOD/Test.cpp
@@ -0,0 +1,8 @@
+#include <bits/stdc++.h>
+using namespace std;
+int main() {
+    int a = 7;
+    int b = (a & (-3));
+    cout << b << endl;
+    return 0;
+}
\ No newline at end of file