using System;

public class Program

{

    public static void Main()

    {

        int i;

        int asarot;

        int sum=0;

        for(i=100;i<=999;i++)

        {asarot=i/10%10;

         if (asarot%3==0)sum=sum+i;

    }

        Console.WriteLine("the sum is "+sum);

    }

}