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())
x,y=[],[]
p=[]
for i in range(N):
    a,b=map(int,input().split())
    x.append(a);y.append(b)
    p.append((a,b))
x.sort()
y.sort()
ans=10**30
for r in range(N):
    for l in range(r):
        for u in range(N):
            for d in range(u):
                R,L,U,D=x[r],x[l],y[u],y[d]
                cnt=0
                m=(R-L)*(U-D)
                for i in range(N):
                    if p[i][0]>=L and p[i][0]<=R and p[i][1]>=D and p[i][1]<=U:
                        cnt+=1
                if cnt>=K:
                    ans=min(ans,m)
print(ans)