A10632 | The New Year: Meeting Friends

There are three friend living on the straight line $Ox$ in Lineland. The first friend lives at the point $x_{1}$ , the second friend lives at the point $x_{2}$ , and the third friend lives at the point $x_{3}$ . They plan to celebrate the New Year together, so they need to meet at one point. What is the minimum total distance they have to travel in order to meet at some point and celebrate the New Year?

It's guaranteed that the optimal answer is always integer.

The first line of the input contains three distinct integers $x_{1}$ , $x_{2}$ and $x_{3}$ ( $1<=x_{1},x_{2},x_{3}<=100$ ) — the coordinates of the houses of the first, the second and the third friends respectively.

Print one integer — the minimum total distance the friends need to travel in order to meet together.