11 lines
222 B
Python
11 lines
222 B
Python
n = int(input())
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while n > 0:
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time = 0
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dist = 0
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for _ in range(n):
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s, t = list(map(int, input().split()))
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dist += s * (t - time)
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time = t
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print(f"{dist} miles")
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n = int(input())
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