using System;

public class Program

{

    public static void Main()

    {

        int a,b,c;

        Console.WriteLine("give num");

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

        b = a % 10;

        c = a / 10;

        if (a < 100 && a > 0)

        {

            if (b == 7)

                Console.WriteLine("seven");

            else if (c == 7)

                Console.WriteLine("seven");

            else if (a % 7 == 0)

                Console.WriteLine("seven");

            else

                Console.WriteLine("not seven");

​

}

​

        else

            Console.WriteLine("WRONG NUMBER");

    }

}