1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
n,tones,counter = int(input()),input().split(),0
tab1,tab2 = [int(tones[i]) for i in range(n) if i%2==0], [int(tones[i]) for i in range(n) if i%2!=0]
if tab1[0]>tab2[0]:
    for i in range(int(n/2)):
        if tab1[i]<=tab2[i] or tab2[i]>=tab1[i+1]:
            counter+=1
else:
    for i in range(int(n/2)):
        if tab1[i]>=tab2[i] or tab2[i]<=tab1[i+1]:
            counter+=1
print(counter)