import ipdb
from collections import deque
from bisect import bisect_right
N,K = map(int,input().split())
P = list(map(int,input().split()))
Lmax = []
Lmin = []
if P[1]>P[0]:
    flag = 1
else:
    flag = -1
for i in range(2,N):
    if P[i]>P[i-1]:
        if flag==1:continue
        else:
            Lmin.append([i-1,P[i-1]])
            flag = 1
    else:
        if flag==1:
            Lmax.append([i-1,P[i-1]])
            flag = -1
        else:continue
cnt = 0
flagMono = 0
indmin = bisect_right(Lmin,[K-1,P[K-1]])
Smax = deque([0])
Smin = deque([0])
for i in range(1,K):
    while Smax:
        if P[Smax[-1]]<P[i]:
            Smax.pop()
        else:break
    Smax.append(i)
    while Smin:
        if P[Smin[-1]]>P[i]:
            Smin.pop()
        else:break
    Smin.append(i)    
if P[0]==P[Smin[0]] and P[K-1]==P[Smax[0]] and (len(Lmin)==0 or indmin==0 or Lmin[indmin-1][0]==0):
    flagMono=1
    cnt += 1
elif P[0]==P[Smin[0]] and K<N and P[K]>P[Smax[0]]:
    pass
else:
    cnt += 1
for i in range(1,N-K+1):
    if Smax[0]==i-1:
        Smax.popleft()
    while Smax:
        if P[Smax[-1]]<P[i+K-1]:
            Smax.pop()
        else:break
    Smax.append(i+K-1)
    if Smin[0]==i-1:
        Smin.popleft()
    while Smin:
        if P[Smin[-1]]>P[i+K-1]:
            Smin.pop()
        else:break
    Smin.append(i+K-1)
    indmin = bisect_right(Lmin,[i+K-1,P[i+K-1]])
    if P[i]==P[Smin[0]] and P[i+K-1]==P[Smax[0]] and (len(Lmin)==0 or indmin==0 or Lmin[indmin-1][0]<=i):
        if flagMono==0:
            flagMono = 1
            cnt += 1
        else:
            pass
    elif P[i]==P[Smin[0]] and i+K<N and P[i+K]>P[Smax[0]]:
        continue
    else:
        cnt += 1
print(cnt)

### FIXED CODE ###

from collections import deque
from bisect import bisect_right
N,K = map(int,input().split())
P = list(map(int,input().split()))
Lmax = []
Lmin = []
if P[1]>P[0]:
    flag = 1
else:
    flag = -1
for i in range(2,N):
    if P[i]>P[i-1]:
        if flag==1:continue
        else:
            Lmin.append([i-1,P[i-1]])
            flag = 1
    else:
        if flag==1:
            Lmax.append([i-1,P[i-1]])
            flag = -1
        else:continue
cnt = 0
flagMono = 0
indmin = bisect_right(Lmin,[K-1,P[K-1]])
Smax = deque([0])
Smin = deque([0])
for i in range(1,K):
    while Smax:
        if P[Smax[-1]]<P[i]:
            Smax.pop()
        else:break
    Smax.append(i)
    while Smin:
        if P[Smin[-1]]>P[i]:
            Smin.pop()
        else:break
    Smin.append(i)    
if P[0]==P[Smin[0]] and P[K-1]==P[Smax[0]] and (len(Lmin)==0 or indmin==0 or Lmin[indmin-1][0]==0):
    flagMono=1
    cnt += 1
elif P[0]==P[Smin[0]] and K<N and P[K]>P[Smax[0]]:
    pass
else:
    cnt += 1
for i in range(1,N-K+1):
    if Smax[0]==i-1:
        Smax.popleft()
    while Smax:
        if P[Smax[-1]]<P[i+K-1]:
            Smax.pop()
        else:break
    Smax.append(i+K-1)
    if Smin[0]==i-1:
        Smin.popleft()
    while Smin:
        if P[Smin[-1]]>P[i+K-1]:
            Smin.pop()
        else:break
    Smin.append(i+K-1)
    indmin = bisect_right(Lmin,[i+K-1,P[i+K-1]])
    if P[i]==P[Smin[0]] and P[i+K-1]==P[Smax[0]] and (len(Lmin)==0 or indmin==0 or Lmin[indmin-1][0]<=i):
        if flagMono==0:
            flagMono = 1
            cnt += 1
        else:
            pass
    elif P[i]==P[Smin[0]] and i+K<N and P[i+K]>P[Smax[0]]:
        continue
    else:
        cnt += 1
print(cnt)