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())
P = [tuple(map(int, input().split())) for _ in range(N)]
P.sort()

ans = float('inf')
for i in range(N - K + 1):
    for j in range(i + K - 1, N):
        x = P[j][0] - P[i][0]
        if x == 0:
            continue

        Q = P[i: j + 1]
        Q.sort(key=lambda q: q[1])
        y = Q[-1][1] - Q[0][1]
        for k in range(0, len(Q) - K + 1):
            for l in range(k + K - 1, len(Q)):
                ny = Q[l][1] - Q[k][1]
                if ny == 0:
                    continue
                y = min(y, ny)
        ans = min(ans, x * y)

print(ans)