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:
N,K = map(int,input().split())
z = [0]*N
for i in range(N):
    x,y = map(int,input().split())
    z[i] = (x,y)
z.sort(key=lambda x:x[1])
H = z[N-1][1]-z[0][1]
z.sort()
W = z[N-1][0]-z[0][0]
ans = H*W
for i in range(N-K+1):
    for j in range(i+K-1,N):
        z_ = z[i:j+1].copy()
        W = z_[-1][0]-z_[0][0]
        z_.sort(key=lambda x:x[1])
        for k in range(len(z_)-K+1):
            H = z_[k+K-1][1]-z_[k][1]
            if H*W < ans:
                ans = H*W
print(ans)