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Američka pita | American pie #2

Neka su x,y,z pozitivni realni brojevi za koje je:

\begin{align*}
\sqrt{2x - xy} + \sqrt{2y - xy} & = 1\\
\sqrt{2y - yz} + \hspace{0.1em} \sqrt{2z - yz} & = \sqrt{2}\\
\sqrt{2z - zx\vphantom{y}} + \sqrt{2x - zx\vphantom{y}} & = \sqrt{3}.
\end{align*}

Nađite kvadrat broja (1-x)(1-y)(1-z)

Let x,y,z be positive real numbers such that:

\begin{align*}
\sqrt{2x - xy} + \sqrt{2y - xy} & = 1\\
\sqrt{2y - yz} + \hspace{0.1em} \sqrt{2z - yz} & = \sqrt{2}\\
\sqrt{2z - zx\vphantom{y}} + \sqrt{2x - zx\vphantom{y}} & = \sqrt{3}.
\end{align*}

Find the square of (1-x)(1-y)(1-z)