class Program
    {
        static void Main()
        {

        }
    }


    class MatrixMultiply
    {
        public int[,] Do(int[,] left, int[,] right)
        {
            if (CheckOnCorrect(left, right))
                throw new IndexOutOfRangeException();

            int aRows = left.GetLength(0); int aCols = left.GetLength(1);
            int bRows = right.GetLength(0); int bCols = right.GetLength(1);

            int[,] result = new int[left.GetLength(0),right.GetLength(1)];

            for (int i = 0; i < aRows; ++i) // каждая строка A
                for (int j = 0; j < bCols; ++j) // каждый столбец B
                    for (int k = 0; k < aCols; ++k)
                        result[i,j] += left[i,k] * right[k,j];
            return result;
        }

        public bool CheckOnCorrect(int[,] left, int[,] right)
        {
            if ((left.GetLength(1) == right.GetLength(0)))
                return true;
            else
                return false;
        }
    }


    class MatrixSum
    {
        public int[,] Do(int[,] left, int[,] right)
        {
            if (CheckOnCorrect(left, right))
                throw new IndexOutOfRangeException();

            int[,] result = new int[left.GetLength(0),right.GetLength(1)];

            for (int i = 0; i < left.GetLength(0); ++i)
                for (int j = 0; j < left.GetLength(1); ++j)
                    result[i,j] = left[i,j] + right[i,j];
            return result;
        }

        public bool CheckOnCorrect(int[,] left, int[,] right)
        {
            if ((left.GetLength(0) == right.GetLength(0)) && (left.GetLength(1) == right.GetLength(1)))
                return true;
            else
                return false;
        }
    }


    class IO
    {
        public int[,] ReadMatrix(string path)
        {
            string[] text = File.ReadAllLines(path);
            int[,] result = new int[text.Length, text[0].Split(' ').Length];
            string[] bufer = new string[1];

            for (int i = 0; i < text.Length; i++)
            {
                bufer = text[i].Split(' ');
                for (int j = 0; j < bufer.Length; j++)
                {
                    result[i,j] = int.Parse(bufer[j]);
                }
            }

            return result;
        }

        public int ReadInt(string path)
        {
            string number = File.ReadAllText(path);
            int cons = int.Parse(number);
            return cons;
        }

        public void WriteData(string path, string data)
        {
            File.AppendAllText(path, data);
        }
    }