Absolute Value · Superchallenge problem

The temperature at noon on five days in a row was $-4^\circ$, $3^\circ$, $-7^\circ$, $2^\circ$ and $-1^\circ$. From each day to the next, the temperature went up or down. Add up the SIZES of the four day-to-day changes (ignore whether each was up or down). What is the total?