AA - Jumping on the Clouds

def jumpingOnClouds(c):
    x,y = 0,0
    while x<len(c)-2:
        x = x+1 if c[x+2] else x+2
        y+=1
    if x<len(c)-1:
        y+=1
    return y

n = int(input())

c = list(map(int, input().rstrip().split()))

result = jumpingOnClouds(c)

print(result)