public static void Main(string[] args)
Console.Write("Enter the 1st Periodical Grade:");
double grade1 = Convert.ToDouble (Console.ReadLine());
Console.Write("Enter the 2nd Periodical Grade:");
double grade2 = Convert.ToDouble (Console.ReadLine());
Console.Write("Enter the 3rd Periodical Grade:");
double grade3 = Convert.ToDouble (Console.ReadLine());
double result = grade1 + grade2 + grade3;
Console.WriteLine("Your grade is " + result);
double finalresult = result/3.0;
Console.WriteLine("Your Final Grade is " + finalresult);
Console.WriteLine("Sorry you did not met the passing grade 50.");
} else if (finalresult >=50)
Console.WriteLine("Congratulations! You passed the passing grade 50.");