Equation block with align tabs

\begin{align*} S & = \left\lfloor { { N \bmod 65536 } \over 32768 } \right\rfloor \\ E & = \left\lfloor { { N \bmod 32768 } \over 1024 } \right\rfloor \\ M & = N \bmod 1024. \end{align*}