Given the following information, calculate the total absolute deviation.

Show your answer as a whole number

Week

Demand

Forecast

$1$

$340$

$339$

$2$

$424$

$340$

$3$

$417$

$458$

$4$

$452$

$429$

$5$

$466$

$385$

$6$

$495$

$498$

$7$

$484$

$402$