Redox Reactions

See the following chemical reaction:

\(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{XH}^{+}+6 \mathrm{~F}_{e}^{2+} \rightarrow \mathrm{YCr}^{3+}+6 \mathrm{~F}_{e}^{3+}+\mathrm{Z} \mathrm{H}_{2} \mathrm{O}\)

The sum of \(\mathrm{X}, \mathrm{Y}\) and \(\mathrm{Z}\) is ___________