def jumpingOnClouds(c):

n = len(c)
i = 0
jump = 0

if n == 2:
    return 1

while i < n-2:


    if c[i+2] == 0:
        i = i+2
        jump += 1


    else:
        i = i+1
        jump += 1



if c[-2] == 0 and c[-3] !=0:
    return jump + 1
else:
    return jump