25 lines
510 B
C++
25 lines
510 B
C++
#include <cstdio>
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#include <cstring>
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#include <iostream>
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#include <algorithm>
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#define N 101000
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using namespace std;
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struct YYC
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{
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int x,y;
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bool operator < (const YYC &a)const
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{return x*a.y<y*a.x;}
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}fev[N];
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int n;
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long long ans,sum;
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int main()
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{
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int i;scanf("%d",&n);
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for(i=1;i<=n;i++)scanf("%d",&fev[i].x);
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for(i=1;i<=n;i++)scanf("%d",&fev[i].y);
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sort(fev+1,fev+n+1);
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for(i=1;i<=n;i++)sum+=fev[i].x,ans+=sum*fev[i].y;
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cout<<ans<<endl;
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return 0;
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}
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