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

ans = 10**18*5

for x in combinations(range(N), 2):
    u = max(P[x[0]][0], P[x[1]][0])
    d = min(P[x[0]][0], P[x[1]][0])
    for y in combinations(range(N), 2):
        r = max(P[y[0]][1], P[y[1]][1])
        l = min(P[y[0]][1], P[y[1]][1])
        count = 0
        for i in range(N):
            if d <= P[i][0] <= u and l <= P[i][1] <= r:
                count += 1
        if count >= K:
            ans = min(ans, (u - d) * (r - l))

print(ans)