using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication4
{
    class myclass
    {
        float[,] m = new float[3, 3];
        public myclass() {}
        public myclass(float m11, float m12, float m13, float m21, float m22, float m23, float m31, float m32, float m33)
        {
            m[0, 0] = m11;
            m[0, 1] = m12;
            m[0, 2] = m13;
            m[1, 0] = m21;
            m[1, 1] = m22;
            m[1, 2] = m23;
            m[2, 0] = m31;
            m[2, 1] = m32;
            m[2, 2] = m33;
        }
        public float this[int a, int b]
        {
            get
            {
                return m[a, b];
            }
            set
            {
                m[a, b] = value;
            }
        }
        public static myclass operator *(myclass obj1, myclass obj2)
        {
            myclass res = new myclass();
            for (int row = 0; row < 3; row++)
            {
                for (int col = 0; col < 3; col++)
                {
                    for (int inner = 0; inner < 3; inner++)
                    {
                        res[row, col] += obj1[row, inner] * obj2[inner, col];
                    }
                }
            }
            return res;
        }
        public override string ToString()
        {
            for (int i = 0; i < 3; i++)
            {
                string str = "";
                for (int j = 0; j < 3; j++)
                {
                    str = str + m[i, j].ToString() + "\t";
                }
                Console.WriteLine(str);
            }
            return "";
        }

    }
    class Program
    {
        static void Main(string[] args)
        {
            myclass obj1 = new myclass(1, 2, 3, 4, 5, 6, 7, 8, 9);
            myclass obj2 = new myclass(1, 2, 3, 4, 5, 6, 7, 8, 9);
            myclass mult = obj1 * obj2;
            Console.WriteLine(mult);
        }
    }
}