Problem: Snuke has a permutation (P_0,P_1,\cdots,P_{N-1}) of (0,1,\cdots,N-1).

Now, he will perform the following operation exactly once:

* Choose K consecutive elements in P and sort them in ascending order.



Find the number of permutations that can be produced as P after the operation.

Constraints

* 2 \leq N \leq 200000
* 2 \leq K \leq N
* 0 \leq P_i \leq N-1
* P_0,P_1,\cdots,P_{N-1} are all different.
* All values in input are integers.

Input

Input is given from Standard Input in the following format:


N K
P_0 P_1 \cdots P_{N-1}


Output

Print the number of permutations that can be produced as P after the operation.

Examples

Input

5 3
0 2 1 4 3


Output

2


Input

4 4
0 1 2 3


Output

1


Input

10 4
2 0 1 3 7 5 4 6 8 9


Output

6

Solution (in PYTHON3):

Solution:
from itertools import accumulate
from collections import deque

N, K, *P = map(int, open(0).read().split())

mi = []
Q = deque()
for i, p in enumerate(P):
    while Q and P[Q[-1]] > p:
        Q.pop()
    Q.append(i)
    if Q[0] == i - K:
        Q.popleft()
    mi.append(Q[0])

ma = []
Q = deque()
for i, p in enumerate(P):
    while Q and P[Q[-1]] < p:
        Q.pop()
    Q.append(i)
    if Q[0] == i - K:
        Q.popleft()
    ma.append(Q[0])

mi = mi[K - 1:]
ma = ma[K - 1:]

B = [mi[i] != i or ma[i + 1] != i + K for i in range(N - K)]

A = [0] + list(accumulate(x < y for x, y in zip(P, P[1:])))
S = [y - x != K - 1 for x, y in zip(A, A[K - 1:])]

ans = 1 + sum(b for b, s in zip(B, S[1:]) if s)
if S[0] and not all(S):
    ans += 1
print(ans)