Differentiation

If \(y=\left(1+\frac{1}{x}\right)\left(1+\frac{2}{x}\right)\left(1+\frac{3}{x}\right) \ldots\left(1+\frac{n}{x}\right)\) and \(x \neq 0\). When \(x=-1, \frac{d y}{d x}\) is equal to