You only need one negative number to get a negative product, so just use one -1, and pick 4 positive integers that have sum 18. Here are four examples: -1+1+4+6+7=17 and (-1)(1)(4)(6)(7)=-168 -1+2+3+6+7=17 and (-1)(2)(3)(6)(7)=-252 -1+2+4+5+7=17 and (-1)(2)(4)(5)(7)=-280 -1+3+4+5+6=17 and (-1)(3)(4)(5)(6)=-360 Edwin