using System;

public class Program

{

    public static void Main()

    {

        string input;

        string predicate="";

        Console.WriteLine("Business Type");

        input=Console.ReadLine(); 

        double bt = Convert.ToDouble(input);

        Console.WriteLine("Monthly Income");

        input=Console.ReadLine(); 

        double mi = Convert.ToDouble(input);

         Console.WriteLine("Domicili");

         input=Console.ReadLine(); 

        double dm = Convert.ToDouble(input);

        double btValue=0.5*bt;

        double miValue=0.3*mi;

        double dmValue=0.2*dm;

        double Total=btValue+miValue+dmValue;

         if (Total >90) {

          predicate = "A";

         }

        else if (Total>=75 && Total<=90) {

          predicate = "B";

         }

        else if  (Total>=60 && Total<=75){

          predicate = "C";

         }

                  Console.WriteLine("Total Value=" +Total);

                 Console.WriteLine("Credit Score="+ predicate);

}

}