class Matrix {
public:
    vector<vector<int>> a;

    Matrix operator+(const Matrix& b) {
    Matrix m;
    m.a.resize(b.a.size());
        for (int i = 0; i < a.size(); i++) {
            m.a[i].resize(b.a[i].size());
        }

    for (int i = 0; i < b.a.size(); i++) {
        for (int j = 0; j < b.a[i].size(); j++) {
            m.a[i][j] = a[i][j] + b.a[i][j];
        }
    }
    return m;
}
};