Multiply Table

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

    namespace ConsoleApp3
    {
        class Program
        {
            static void Main(string[] args)
            {
            string number = (Console.ReadLine());
            int num1 = 0;
            var num2 = 0;
            var num3 = 0;


            // variant 1
            for (int i = 0; i < number.Length; i++)
            {
                if (i == 0)
                {
                    num1 = int.Parse(number[i].ToString());
                }

                else if (i == 1)
                {
                    num2 = int.Parse(number[i].ToString());
                }

                else if (i == 2)
                {
                    num3 = int.Parse(number[i].ToString());
                }

            }

            // variant 2

            //var num3 = number % 10;
            //var num2 = (number / 10) % 10;
            //var num1 = (number / 100);

            for (int i = 1; i <= num3; i++)
            {
                for (int j = 1; j <= num2; j++)
                {
                    for (int k = 1; k <= num1; k++)
                    {
                        var calc = i*j*k;
                        string total = $"{i} * {j} * {k} = {calc};";
                        Console.WriteLine(total);
                    }
                }
            }


            }
        }
    }