public static void Main()
Console.WriteLine("Welcome. What's your name?");
name = Console.ReadLine();
Console.WriteLine("Nice to meet you, " + name + "!");
Console.WriteLine("Now, " + name + ", how many classes are you studying?");
n = int.Parse(Console.ReadLine());
Console.WriteLine("Please write the result of the last class");
a = int.Parse(Console.ReadLine());
Console.WriteLine("GOOD, YOU PASSED");
Console.WriteLine("SORRY, YOU FAILED");
Console.WriteLine("Please write the result of the first class");
a = int.Parse(Console.ReadLine());
Console.WriteLine("GOOD, YOU PASSED");
Console.WriteLine("SORRY, YOU FAILED");
Console.WriteLine("Please write the result of the next class");
a = int.Parse(Console.ReadLine());
Console.WriteLine("GOOD, YOU PASSED");
Console.WriteLine("SORRY, YOU FAILED");
Console.WriteLine("Your avarage is:" + " " + t/n);
if(t/n<= 100 && t/n>= 70)
Console.WriteLine("GOOD, YOU PASSED");
Console.WriteLine("SORRY, YOU FAILED");