using System;
 
class Program
{
    static void Main()
    {
        Console.Write("Введите оценку от 0 до 100: 90 ");
        int grade = Convert.ToInt32(Console.ReadLine());
 
        if (grade < 0 || grade > 100)
        {
            Console.WriteLine("Ошибка! Оценка должна быть от 0 до 100.30");
        }
        else if (grade >= 90)
        {
            Console.WriteLine("Отлично");
        }
        else if (grade >= 75)
        {
            Console.WriteLine("Хорошо");
        }
        else if (grade >= 50)
        {
            Console.WriteLine("Удовлетворительно");
        }
        else
        {
            Console.WriteLine("Неудовлетворительно");
        }
    }
}

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