// 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.

		function sumOfMultiplesLessThan(number) {
		    "use strict";
		    var sum = 0, // initialize the sum locally
		        i = 1; // starting value for iteration 
		    for (i; i < number; i += 1) { // iterate through the number
		        if (i % 3 === 0 || i % 5 === 0) { // true if divisible by 3 or 5
		            sum += i; // add the iterator value i to the sum
		        }
		    }
		    return sum;
		}

		console.log(sumOfMultiplesLessThan(10)); // output: 23
		console.log(sumOfMultiplesLessThan(1000)); // output: 233168