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:
import sys
input = sys.stdin.readline
def inputs():return [int(x) for x in input().split()]
N,K = inputs()
xy = [inputs() for _ in range(N)]
#xy = sorted(xy,key=lambda x: x[1])
xy = sorted(xy,key=lambda x: x[0])
#print(xy)
ans = 10**20
for i in range(N-K+1):
  for j in range(i+K-1,N):
    #print(i,j)
    xy1 = xy[i:j+1]
    #print(xy1)
    xy1 = sorted(xy1,key=lambda x: x[1])
    mi = min(xy1[i+K-1][1]-xy1[i][1] for i in range(len(xy1)-K+1))
    ans = min(ans,(xy[j][0]-xy[i][0])*mi)
print(ans)