08. Graduation

string name = Console.ReadLine();

double sum = 0;
int clas = 1;
int failedTimes = 0;

while (clas <= 12)
{
    double grade = double.Parse(Console.ReadLine());

    if (grade >= 4)
    {
        clas++;
        sum += grade;
        continue;
    }

    failedTimes++;

    if (failedTimes == 2)
    {
        Console.WriteLine($"{name} has been excluded at {clas} grade");
        break;
    }
}

if (clas > 12)
{
    Console.WriteLine($"{name} graduated. Average grade: {sum/12:f2}");
}