A computer software firm has experienced the demand for their software package as shown below.

Month Demand $($D$)$

$156$

$261$

$355$

$470$

$566$

$665$

Using $=0\mathrm{.}4,$ what is the exponential smoothing forecast for month $3?($Assume

F

$1$

$=56)($answer in whole number$)$