using System.IO;
using System;

class Matrix
{
    public Matrix(int rows, int cols)
    {
        data = new double[rows, cols];
    }

    public Matrix(double[,] d)
    {
        data = new double[d.GetLength(0), d.GetLength(1)];

        for (int i = 0; i < data.GetLength(0); i++)
            for (int j = 0; j < data.GetLength(1); j++)
                data[i, j] = d[i, j];
    }

    public Matrix(Matrix m)
    {
        data = new double[m.data.GetLength(0), m.data.GetLength(1)];

        for (int i = 0; i < data.GetLength(0); i++)
            for (int j = 0; j < data.GetLength(1); j++)
                data[i, j] = m.data[i, j];
    }

    public double this[int r, int c]
    {
        get
        {
            return data[r, c];
        }
        set
        {
            data[r, c] = value;
        }
    }
    public static Matrix operator+(Matrix lhs, Matrix rhs)
    {
        //Сделать проверку на одинаковость размеров

        double[,] d = new double[lhs.data.GetLength(0), lhs.data.GetLength(1)];

        for (int i = 0; i < d.GetLength(0); i++)
            for (int j = 0; j < d.GetLength(1); j++)
                d[i, j] = lhs[i, j] + rhs[i, j];

        return new Matrix(d);
    }

    public double[,] data;
}

class Program
{
    static void Main()
    {
        Matrix a = new Matrix(1, 1);
        a[0, 0] = 5;
        Matrix b = new Matrix(a);
        b[0, 0] = 10;
        Matrix c = a + b;
        Console.WriteLine(c[0, 0]);
    }
}