Problem: We have N points in a two-dimensional plane.
The coordinates of the i-th point (1 \leq i \leq N) are (x_i,y_i).
Let us consider a rectangle whose sides are parallel to the coordinate axes that contains K or more of the N points in its interior.
Here, points on the sides of the rectangle are considered to be in the interior.
Find the minimum possible area of such a rectangle.

Constraints

* 2 \leq K \leq N \leq 50
* -10^9 \leq x_i,y_i \leq 10^9 (1 \leq i \leq N)
* x_i≠x_j (1 \leq i<j \leq N)
* y_i≠y_j (1 \leq i<j \leq N)
* All input values are integers. (Added at 21:50 JST)

Input

Input is given from Standard Input in the following format:


N K
x_1 y_1
:
x_{N} y_{N}


Output

Print the minimum possible area of a rectangle that satisfies the condition.

Examples

Input

4 4
1 4
3 3
6 2
8 1


Output

21


Input

4 2
0 0
1 1
2 2
3 3


Output

1


Input

4 3
-1000000000 -1000000000
1000000000 1000000000
-999999999 999999999
999999999 -999999999


Output

3999999996000000001

Solution (in PYTHON3):

Solution:
from itertools import combinations
n, k = map(int, input().split())
dots = sorted([list(map(int, input().split())) for _ in range(n)])

ans = float("inf")
for x1, x2 in combinations(range(n), 2):
	wid = dots[x2][0] - dots[x1][0]
	dots_cand = sorted(dots[x1: x2 + 1], key=lambda x: x[1])
	for y1, y2 in combinations(range(x2 + 1 - x1), 2):
		if y2 - y1 + 1 >= k:
			area = (dots_cand[y2][1] - dots_cand[y1][1]) * wid
			if area < ans:
				ans = area

print(ans)