using System;

public class Matrix

{

    int m_a;

    int m_b;

    int m_c;

    int m_d;

    public Matrix(int a, int b, int c, int d)

    {

        m_a = a;

        m_b = b;

        m_c = c;

        m_d = d;

    }

    public static Matrix operator*(int n, Matrix A)

    {

        return A.scalarMult(n);

    }

    public static Matrix operator+(Matrix A, Matrix B)

    {

        return A.add(B);

    }

    public static Matrix operator-(Matrix A, Matrix B)

    {

        return A.subtract(B);

    }

    public Matrix add(Matrix other)

    {

        return new Matrix(m_a + other.m_a, m_b + other.m_b, m_c + other.m_c, m_d + other.m_d);

    }

    public Matrix scalarMult(int n)

    { 

        return new Matrix(n*m_a, n*m_b, n*m_c, n*m_d);

    }

    public Matrix subtract(Matrix other)

    {

        return new Matrix(m_a - other.m_a, m_b - other.m_b, m_c - other.m_c, m_d - other.m_d);

    }

    public override String ToString()

    {

        return "|" + m_a + "\t" + m_b + "|\n|" + m_c + "\t" + m_d + "|";

    }

}

public class Program

{

    public static void Main()

    {

        Matrix A = new Matrix(1, 2, 3, 4);

        Matrix B = new Matrix(4, 2, 6, 3);

        Console.WriteLine(A);

        Console.WriteLine("+");

        Console.WriteLine(B);

        Console.WriteLine("=");

        Console.WriteLine(A+B);

        Console.WriteLine();

        Console.WriteLine("2");

        Console.WriteLine("*");

        Console.WriteLine(A);

        Console.WriteLine("=");

        Console.WriteLine(A.scalarMult(2));

    }

}

​