Project Euler #1: Multiples of 3 and 5

Problem:
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. Find the sum of all the multiples of 3 or 5 below 1000.

Answer: 233168

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Solution

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import java.util.*; public class Solution { public static void main(String[] args) { Scanner in = new Scanner(System.in); int t = in.nextInt(); for(int a0 = 0; a0 < t; a0++){ long n = in.nextLong()-1; System.out.println((n-n%3)*(n/3+1)/2 + (n-n%5)*(n/5+1)/2 - (n-n%15)*(n/15+1)/2); } } }