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How can I hide the first equation number as in the picture in latex

enter image description here

\documentclass{article}
\begin{document}
\begin{align}
R=p(S\text{ working})&= p(i\text{ working}) p(S\text{ working}|i\text{ working})\\
&+ p(i\text{ faild})p(S\text{ working}|i\text{ faild})
\end{align}
\end{document}
  • Use \nonumber or \notag. – Werner Feb 1 '17 at 18:15