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n = int(input())
tony = input().split()
tony2 = []
pom = 0
pom1 = 0
for i in range(n):
    tony[i] = int(tony[i])
    tony2.append(tony[i])


wyzejnizej = True
for i in range(1, n):
    if tony[i] >= tony[i-1] and wyzejnizej:
        pom += 1
        tony[i] = -1000000
    elif tony[i] <= tony[i-1] and wyzejnizej == False:
        pom += 1
        tony[i] = 1000000
    wyzejnizej = not wyzejnizej


wyzejnizej = False
for i in range(1, n):
    if tony2[i] >= tony2[i - 1] and wyzejnizej:
        pom1 += 1
        tony2[i] = -1000000
    elif tony2[i] <= tony2[i - 1] and wyzejnizej == False:
        pom1 += 1
        tony2[i] = 1000000
    wyzejnizej = not wyzejnizej

if pom > pom1:
    print(pom1)
else:
    print(pom)