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n = int(input())
a = [int(i) for i in str(input()).split()]
if a[0] <= a[1]: a.insert(0,1000001) 
if len(a)%2 == 0: a.append(1000001)
n = 0
for i in range(1,len(a),2):
        if a[i] >= a[i-1] and a[i] >= a[i+1]:
            n+=1
            a[i] = -1000001  
        if a[i] >= a[i-1]:
            n+=1
            a[i-1] = 1000001
        if a[i] >= a[i+1]:
            n+=1
            a[i+1] = 1000001
print(n)