using System;

namespace MatrixClass
{
    class Matrix
    {

        public int matrixDemention = 3;
        public int[,] matrix;

        public Matrix(int size)
        {
            this.matrixDemention = size;
            this.matrix = new int[size, size];
        }

        public int this[int x, int y]
        {
            get
            {
                return matrix[x, y];
            }
            set
            {
                matrix[x, y] = value;
            }
        }


        public static Matrix operator +(Matrix a, Matrix b)
        {
            Matrix newMatrix = new Matrix(a.matrixDemention);

            for (int i = 0; i < a.matrixDemention; i++)
            {
                for (int j = 0; j < a.matrixDemention; j++)
                {
                    newMatrix[i, j] = a[i, j] + b[i, j];
                }
            }

            return newMatrix;
        }


        public static Matrix operator -(Matrix a, Matrix b)
        {
            Matrix newMatrix = new Matrix(a.matrixDemention);

            for (int i = 0; i < a.matrixDemention; i++)
            {
                for (int j = 0; j < a.matrixDemention; j++)
                {
                    newMatrix[i, j] = a[i, j] - b[i, j];
                }
            }

            return newMatrix;
        }

        public static Matrix operator *(Matrix a, Matrix b)
        {
            Matrix newMatrix = new Matrix(a.matrixDemention);

            for (int i = 0; i < a.matrixDemention; i++)
            {
                for (int j = 0; j < a.matrixDemention; j++)
                {
                    newMatrix[i, j] = a[i, j] * b[j, i];
                }
            }

            return newMatrix;
        }
    }
}