Given a set of points, calculate the sum of all Manhattan distances between two point pairs.

Input

The first line has an integer $n$: the number of points.

The following $n$ lines describe the points. Each line has two integers $x$ and $y$. You can assume that each point is distinct.

Output

Print the sum of all Manhattan distances.

Constraints

• $1 \le n \le 2 \cdot 10^5$
• $-10^9 \le x, y \le 10^9$

Example

Input:

5
1 1
3 2
2 4
2 1
4 5

Output:

36