using System;

public class Program

{

    public static void Main(String[] args)

    {

        int n,r,sum=0,no;

        Console.WriteLine("enter a no=");

        n=int.Parse(Console.ReadLine());

        no=n;

        for(;n>0;){

            r=n%10;

            sum=sum+r;

            n=n/10;

        }

        Console.WriteLine(sum);

        if(sum==7){

            Console.WriteLine("it  is  buzz no");

        }

        else if(no%10==7){

            Console.WriteLine("it  is  buzz no");

        }

        else if(no%7==0){

            Console.WriteLine("it  is  buzz no");

        }

        else {

            Console.WriteLine("it  is  not a buzz no");

        }

    }

}