here's my code

class Program
    {
        static void Main(string[] args)
        {
            int num1, num2, num3, num4, num5 = 0;
            int categoryA =20000;
            int categoryB = 75000;
            int categoryC = 5000;
            int categoryB1 = 60000;

            Console.WriteLine("Please enter 5 numbers: ");
            num1 = Int32.Parse(Console.ReadLine());
            num2 = Int32.Parse(Console.ReadLine());
            num3 = Int32.Parse(Console.ReadLine());
            num4 = Int32.Parse(Console.ReadLine());
            num5 = Int32.Parse(Console.ReadLine());
            if (num1 >= categoryC)
            {
                if (num1 <= categoryA)
                {
                    Console.WriteLine("Category A");
                }
                else
                {
                    if (num1 >= categoryB1)
                    {
                        if (num1 <= categoryB)
                        {
                            Console.WriteLine("Category B");
                        }
                        else
                        {
                            Console.WriteLine("Category C");
                        }
                    }
                    else
                    {
                        Console.WriteLine("Category C");
                    }

                }

                if (num2 >= categoryC)
                {
                    if (num2 <= categoryA)
                    {
                        Console.WriteLine("Category A");
                    }
                    else
                    {
                        if (num2 >= categoryB1)
                        {
                            if (num2 <= categoryB)
                            {
                                Console.WriteLine("Category B");
                            }
                            else
                            {
                                Console.WriteLine("Category C");
                            }
                        }
                        else
                        {
                            Console.WriteLine("Category C");
                        }

                    }
                    if (num3 <= categoryA)
                    {
                        Console.WriteLine("Category A");
                    }
                    else
                    {
                        if (num3 >= categoryB1)
                        {
                            if (num3 <= categoryB)
                            {
                                Console.WriteLine("Category B");
                            }
                            else
                            {
                                Console.WriteLine("Category C");
                            }
                        }
                        else
                        {
                            Console.WriteLine("Category C");
                        }

                    }
                    if (num4 <= categoryA)
                    {
                        Console.WriteLine("Category A");
                    }
                    else
                    {
                        if (num4 >= categoryB1)
                        {
                            if (num4 <= categoryB)
                            {
                                Console.WriteLine("Category B");
                            }
                            else
                            {
                                Console.WriteLine("Category C");
                            }
                        }
                        else
                        {
                            Console.WriteLine("Category C");
                        }

                    }
                    if (num5 <= categoryA)
                    {
                        Console.WriteLine("Category A");
                    }
                    else
                    {
                        if (num5 >= categoryB1)
                        {
                            if (num5 <= categoryB)
                            {
                                Console.WriteLine("Category B");
                            }
                            else
                            {
                                Console.WriteLine("Category C");
                            }
                        }
                        else
                        {
                            Console.WriteLine("Category C");
                        }

                    }
                }
            }
            else
            {
                Console.WriteLine("category C");
                Console.ReadKey();
            }


            Console.ReadKey();


        }
    }
}

Same problem as your other post.

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