Пробвай този код:

using System;

namespace ConsoleApp17
{
    class Program
    {
        static void Main(string[] args)
        {
            double budgetActors = double.Parse(Console.ReadLine());
            string nameOfActor = string.Empty;
            double salaryOut = 0;

            while ((nameOfActor = Console.ReadLine()) != "ACTION")
            {
                if(nameOfActor.Length <= 15 && nameOfActor.Length > 0)
                {
                    double salary = double.Parse(Console.ReadLine());
                    salaryOut = salary;
                }
                else
                {
                    salaryOut = budgetActors * 0.20;
                }

                if (budgetActors < salaryOut)
                {
                    break;
                }
                budgetActors -= salaryOut;
            }
            if (budgetActors >= salaryOut)
            {
                Console.WriteLine($"We are left with {budgetActors:f2} leva.");
            }
            else
            {
                Console.WriteLine($"We need {(salaryOut - budgetActors):f2} leva for our actors.");
            }
        }
    }
}

Не съм чел условието, но до колкото виждам от кода става дума за пари. Пробвай вместо double да използваш decimal  https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/floating-point-numeric-types

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