❔ My Input of the User Isn't Staying on the Same Line

namespace Calculator
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Welcome to the C# version of the calculator!");

            Console.WriteLine("What would you like to do? \n1 = Addition\n2 = Subtraction\n3 = Multiplication\n4 = Division\n -> ");
            int operator_choice = Convert.ToInt32(Console.ReadLine());

            if (operator_choice == 1)
            {
                Console.WriteLine("What is your first number? \n -> ");
                int firstNumber = Convert.ToInt32(Console.ReadLine());

            }

        }
    }
}