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[[http://acm.hdu.edu.cn/showproblem.php?pid=6581|HDU6581]]
#include
#include
#include
#include
#include
#define LL long long
using namespace std;
const int N=1e5+10;
int n;
LL l[N],s[N],v[N];
int read()
{
int x=0,f=1;char c=getchar();
while(c<'0'||c>'9'){if(c=='-')f=-1;c=getchar();}
while(c>='0'&&c<='9'){x=x*10+c-'0';c=getchar();}
return x*f;
}
int main()
{
while(~scanf("%d",&n))
{
LL len=0;
double mint=0;
for(int i=0;i<=n;i++)l[i]=read();
for(int i=0;i<=n;i++)s[i]=read();
for(int i=0;i<=n;i++)v[i]=read();
for(int i=0;i<=n;i++)
{
if(!i)mint=s[i]*1.0/v[i];
else len+=l[i],mint=max(mint,((s[i]+len)*1.0)/v[i]);
}
printf("%.10lf\n",mint);
}
return 0;
}