using System;

public class Program

{

    public static int Solution(int value)

    {

        int sum = 0;

        for (int i= 1; i < value; i++)

        {

            int multiples3 = 3 * i;

            int multiples5 = 5 * i;

            if (multiples3 != multiples5)

            {

                sum = sum+multiples3+multiples5;

            }

            else

            {

                sum = sum + multiples3;

            }     

        }

        return (sum);

    }

}