### BUGGY CODE ###

class SegmentTree():
    def __init__(self, values, merge_func=min, default=float("inf")):
        n = len(values)
        self.size = 1
        self.default = default
        self.merge = merge_func
        while self.size < n:
            self.size *= 2
        # tree[0] = empty
        # child of tree[n] = tree[n*2], tree[n*2+1]
        self.tree = [self.default] * self.size * 2
        for i in range(n):
            self.tree[self.size + i] = values[i]
        for i in range(self.size-1, 0, -1):
            self.tree[i] = self.merge(self.tree[i*2], self.tree[i*2+1])

    def update(self, index, value):
        index += self.size
        self.tree[index] = value
        while index > 1:
            index //= 2
            self.tree[index] = self.merge(
                self.tree[index*2], self.tree[index*2+1])

    def __query(self, a, b, k, l, r):
        if r <= a or b <= l:
            return self.default
        if a <= l and r <= b:
            return self.tree[k]
        left = self.__query(a, b, k*2, l, (l+r)//2)
        right = self.__query(a, b, k*2+1, (l+r)//2, r)
        return self.merge(left, right)

    # query segmentation value of [a, b)
    def query(self, a, b):
        return self.__query(a, b, 1, 0, self.size)


def main():
    N, K = map(int, input().split())
    P = list(map(int, input().split()))
    seq = 1
    for i in range(K-1):
        if P[i] < P[i+1]:
            seq += 1
        else:
            seq = 1
    has_orig = seq == K
    rmq = SegmentTree(P)
    rMq = SegmentTree(P, merge_func=max, default=-1)
    ans = 1
    for i in range(N-K):
        if P[i+K-1] < P[i+K]:
            seq += 1
        else:
            seq = 1
        if seq >= K:
            if not has_orig:
                has_orig = True
                ans += 1
            continue
        mn = rmq.query(i, i+K+1)
        mx = rMq.query(i, i+K+1)
        if P[i] != mn or P[i+K] != mx:
            ans += 1
    print(ans)


if __name__ == "__main__":
    main()


### FIXED CODE ###

import math


def main():
    N, K = map(int, input().split())
    P = list(map(int, input().split()))
    seq = 1
    for i in range(K-1):
        if P[i] < P[i+1]:
            seq += 1
        else:
            seq = 1
    has_orig = seq == K
    ln = int(math.log(K, 2))
    dp1 = [[0] * N for _ in range(ln+1)]
    dp2 = [[0] * N for _ in range(ln+1)]
    dp1[0] = P
    dp2[0] = P
    for k in range(ln):
        for i in range(N-2**k):
            dp1[k+1][i] = min(dp1[k][i], dp1[k][i+2**k])
            dp2[k+1][i] = max(dp2[k][i], dp2[k][i+2**k])
    rmq = [float("inf")] * (N-K+1)
    rMq = [0] * (N-K+1)
    for i in range(N-K+1):
        idx = i
        for k in range(ln+1)[::-1]:
            if K & (2**k):
                rmq[i] = min(rmq[i], dp1[k][idx])
                rMq[i] = max(rMq[i], dp2[k][idx])
                idx += 2**k
    ans = 1
    for i in range(N-K):
        if P[i+K-1] < P[i+K]:
            seq += 1
        else:
            seq = 1
        if seq >= K:
            if not has_orig:
                has_orig = True
                ans += 1
            continue
        if P[i] != rmq[i] or P[i+K] < rMq[i]:
            ans += 1
    print(ans)


if __name__ == "__main__":
    main()