diff --git a/123.cpp b/123.cpp
new file mode 100644
index 0000000..d854559
--- /dev/null
+++ b/123.cpp
@@ -0,0 +1,35 @@
+#include <iostream>
+#include <vector>
+#include <gtest/gtest.h>
+using namespace std;
+vector<int> vecc(vector<int> vec, int n) {
+    for (int i = 0; i < vec.size(); i++) {
+        vec[i] += n;
+    }
+    return vec;
+}
+
+
+
+TEST(VecTest, test1) {
+    vector<int> input = {1, 2, 3, 4, 5};
+    vector<int> expected = {6, 7, 8, 9, 10};
+    ASSERT_EQ(vecc(input, 5), expected);
+}
+
+TEST(VecTest, test2) {
+    vector<int> input = {5, -3, 7, 2, 0};
+    vector<int> expected = {2, -6, 2, -3, -5};
+    ASSERT_EQ(vecc(input, -3), expected);
+}
+
+TEST(VecTest, test3) {
+    vector<int> input = {10000, 20000, 30000};
+    vector<int> expected = {20000, 30000, 40000};
+    ASSERT_EQ(vecc(input, 10000), expected);
+}
+
+int main(int argc, char **argv) {
+    testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}
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