p03576 AtCoder Beginner Contest 075 - Axis-Parallel Rectangle
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
```python
N, K = map(int, input().split())
X, Y = [], []
D = []
for i in range(N):
    x, y = map(int, input().split())
    X.append(x)
    Y.append(y)
    D.append((x, y))

X = sorted(X)
Y = sorted(Y)
num = float("inf")
for i in range(N - 1):
    for j in range(i + 1, N):
        for k in range(N - 1):
            for l in range(k + 1, N):
                tmp = 0
                for m in range(N):
                    if X[i] <= D[m][0] <= X[j] and Y[k] <= D[m][1] <= Y[l]:
                        tmp += 1
                if tmp >= K:
                    num = min(num, (X[j] - X[i]) * (Y[l] - Y[k]))

print(num)
```