9 lines
227 B
Python
9 lines
227 B
Python
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import sys
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L = [ int(l[:-1]) for l in sys.stdin.readlines() ]
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Z = zip(L, L[1:], L[2:])
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M = [ a+b+c for (a,b,c) in Z]
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Y = zip(M, M[1:])
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P = [ [0,1][a<b] for (a,b) in Y ]
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#print([(l,m,p) for (l,m,p) in zip(L,M,P)])
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print(sum(P))
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