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def hill_and_vally(s):
d=[x1-x0 for x0,x1 in zip(s,s[1:]) if x1!=x0]
return 2+sum(d0*d1<0 for d0,d1 in zip(d,d[1:]))
#>>> hill_and_vally([1,0,0,0,1])
#>>> hill_and_vally([0,1,0,1,0])
#>>> hill_and_vally([0,2,2,1,1,0,0])
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