N = int(raw_input())
 
L =  raw_input()
L = L.split()

db = 0
for i in range(1,len(L)-1):
    if (int(L[i])>int(L[i-1]))and(int(L[i])>int(L[i+1])):
        db+=1

if L[len(L)-1]>L[len(L)-2]:
    db+=1
                
print db