2021-12-01 23:22:53 +00:00
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import sys
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2021-12-20 19:04:33 +00:00
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L = list(map(int,sys.stdin.read().splitlines()))
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2021-12-02 08:46:21 +00:00
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print(sum([0,1][a<d] for (a,d) in zip(L, L[3:])))
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# window1 = [A,B,C] ; window2 = [B,C,D]
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# sum(Window1) <? sum(window2)
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# (A+B+C) <? (B+C+D)
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# (A+B+C)-B-C <? (B+C+D)-B-C
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# A <? D
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# eg: comparing A+B+C and B+C+D is the same as comparing A and D
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