diff --git a/Sem2/Makefile b/Sem2/Makefile
new file mode 100644
index 0000000..98a53ae
--- /dev/null
+++ b/Sem2/Makefile
@@ -0,0 +1,8 @@
+CXX = g++
+CXXFLAGS = -Wall -g --std=c++11
+
+main: task1.o
+
+task1.o: task1.cpp
+	clang-format -i --style=webkit task1.cpp
+	$(CXX) $(CXXFLAGS) -o task1.o task1.cpp
\ No newline at end of file
diff --git a/Sem2/task1.cpp b/Sem2/task1.cpp
new file mode 100644
index 0000000..a4726dd
--- /dev/null
+++ b/Sem2/task1.cpp
@@ -0,0 +1,122 @@
+#include <cstring>
+#include <iostream>
+
+using namespace std;
+
+class DynArr {
+private:
+    int* arr;
+    uint size;
+
+public:
+    void set(uint index, int value)
+    {
+        if (index < size) {
+            if (-100 <= value && value <= 100) {
+                arr[index] = value;
+            } else {
+                cerr << "Tried to set element " << index << " with " << value << " but this value is not in [-100; 100]";
+            }
+
+        } else {
+            cerr << "Tried to set element " << index << " with " << value << " but the array size is " << size << ". Skipping.\n";
+        }
+    }
+    int get(uint index)
+    {
+        if (index < size) {
+            return arr[index];
+        }
+        cerr << "Tried to get element " << index << " from an array with size " << size << ". Returning 0.\n";
+        return 0;
+    }
+    uint length()
+    {
+        return size;
+    }
+    void print()
+    {
+        cout << "Size is " << size << endl;
+        for (uint i = 0; i < size; i++) {
+            cout << arr[i] << " ";
+        }
+        cout << "\n";
+    }
+    DynArr operator+ (const DynArr& second) {
+        DynArr result(second);
+        uint target_size = size;
+        if (second.size < size) target_size = second.size;
+        for (uint i = 0; i < target_size; i++) {
+            result.set(i, result.get(i) + arr[i]);
+        }
+        return result;
+    }
+    DynArr operator- (const DynArr& second) {
+        DynArr result(second);
+        uint target_size = size;
+        if (second.size < size) target_size = second.size;
+        for (uint i = 0; i < target_size; i++) {
+            result.set(i, arr[i] - result.get(i));
+        }
+        return result;
+    }
+    DynArr(uint dsize)
+    {
+        arr = new int(dsize);
+        size = dsize;
+    }
+    DynArr(const DynArr& original)
+    {
+        size = original.size;
+        arr = new int(original.size);
+        memcpy(arr, original.arr, sizeof(int) * size);
+    }
+    ~DynArr()
+    {
+        delete[] arr;
+    }
+};
+
+int main()
+{
+    int i, temp;
+    cout << "Введите размер первого массива: ";
+    cin >> i;
+    DynArr arr(i);
+    i = 0;
+    while (i >= 0) {
+        cout << "Введите номер элемента: ";
+        cin >> i;
+        if (i >= 0) {
+            cout << "Введите его значение: ";
+            cin >> temp;
+            arr.set(i, temp);
+        }
+    }
+    cout << "Первый массив:\n";
+    arr.print();
+
+    cout << "Введите размер второго массива: ";
+    cin >> i;
+    DynArr arr2(i);
+    i = 0;
+    while (i >= 0) {
+        cout << "Введите номер элемента: ";
+        cin >> i;
+        if (i >= 0) {
+            cout << "Введите его значение: ";
+            cin >> temp;
+            arr2.set(i, temp);
+        }
+    }
+    cout << "Первый массив:\n";
+    arr.print();
+    cout << "Второй массив:\n";
+    arr2.print();
+    cout << "Первый + второй:\n";
+    (arr + arr2).print();
+    cout << "Первый - второй:\n";
+    (arr - arr2).print();
+    
+    return 0;
+}
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