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=[0]*n
y=[0]*n
a=[]
for i in range(n):
  x[i],y[i]=map(int,input().split())
  a.append((x[i],y[i]))
ans=4*(10**18)
x.sort()
y.sort()
for i in range(n-1):
  for j in range(i+1,n):
    for l in range(n-1):
      for m in range(l+1,n):
        L=x[i]
        R=x[j]
        D=y[l]
        U=y[m]
        if L==R or U==D:
          continue
        cnt=0
        for s in a:
          if L<=s[0]<=R and D<=s[1]<=U:
            cnt+=1
        if cnt>=k:
          ans=min(ans,(R-L)*(U-D))
print(ans)