ProjectEulerProblem1

/*
Project Euler Question 1:
 
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. 
The sum of these multiples is 23.
Display the sum of all the multiples of 3 or 5 below 1000.
*/
 
import java.util.*;
import java.lang.*;
import java.io.*;

class ProjectEulerProblem1
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int sum = 0;
 
		for(int i = 3; i < 1000; i += 3)
			sum += i;
 
		for(int i = 5; i < 1000; i += 5)
			sum += i;
 
		for(int i = 15; i < 1000; i += 15)
			sum -= i;
 
		System.out.println(sum);
	}
}