20 lines
364 B
Python
20 lines
364 B
Python
import sys
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def solve(N, E, C):
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S = 0
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m = C[0]
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for i in range(0, len(E)):
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if C[i] <= m:
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m = C[i]
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S += m * E[i]
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return S
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if __name__ == '__main__':
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print(solve(int(sys.stdin.readline()),
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list(map(int, sys.stdin.readline().split())),
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list(map(int, sys.stdin.readline().split()))))
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