13 lines
225 B
Python
13 lines
225 B
Python
import sys
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c = float(sys.stdin.readline())
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l = int(sys.stdin.readline())
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ans = 0.0
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for _ in range(l):
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width, length = sys.stdin.readline().split(' ')
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ans += c * float(width) * float(length)
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print(ans)
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