private void findGreatestProduct(String source){
		int digits = source.length();
		int consecutives = 5;
		int biggest = 0;
		for (int i = 0; i < (digits-consecutives);i++){
			int product = 1;
			for (int j = 0; j < 5; j++){
				product = product * Integer.valueOf(source.substring(i+j, i+j+1));
			}
			if (product > biggest){
				biggest = product;
			}
		}
		System.out.println(biggest);
	}