using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(SumOfXOrY(3,5,1000));

        Console.WriteLine("Hello World");

    }

    public static int SumOfXOrY(int x, int y, int max) {

        int sum = 0;

        for(int i = 1; i < max; ++i) {

            if(i % x == 0 || i % y == 0)

                sum += i;

        }

        return sum;

    }

}