/**
 * This class calculates the sum of all multiples of 3
 * or 5 less than 1000
 * @author Tewodros
 * @version 1
 */
public class SumOfMultiplesOfThreeOrFive {
	public static void main (String[] args){
		int multiplesOfThree = 0;
		int multiplesOfFive = 0;
		int multiplesOfFifteen = 0;
		int sum  = 0;
		int i = 1;
    //adding up all multiples of three first
		while (multiplesOfThree + 3 <1000) {
			multiplesOfThree = 3 * i;
			sum += multiplesOfThree;
			i++;
		}
		int j = 1;
    //then add all multiples of 5
		while (multiplesOfFive + 5 <1000) {
			multiplesOfFive = 5 * j;
			sum += multiplesOfFive;
			j++;
		}
		//remove the duplicate multiples
		int k = 1;
		while (multiplesOfFifteen + 15 <1000) {
			multiplesOfFifteen = 15 * k;
			sum -= multiplesOfFifteen;
			k++;
		}
		System.out.println("Sum = " + sum);
	}
}