26 lines
432 B
Python
26 lines
432 B
Python
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import sys
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L = sys.stdin.read().splitlines()
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S = 0
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for report in L:
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l = [int(r) for r in report.split(' ')]
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prem = [l[0]]
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while not all(v == 0 for v in l):
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m = []
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for i in range(0,len(l)-1):
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m.append(l[i+1] - l[i])
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prem.append(m[0])
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l = list(m)
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s = prem[0]
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signe = -1
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for a in prem[1:]:
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s+=(a*signe)
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signe *= -1
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S+=s
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print(S)
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