Doti \(n\) skaitļi \(-2 \leq x_{1}, x_{2}, \ldots, x_{n} \leq 2\), kuru summa ir \(0\). Pierādīt, ka

\[\left|x_{1}^{3}+x_{2}^{3}+\ldots+x_{n}^{3}\right| \leq 2 n\]