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#include <iostream>

#include <stdio.h>

#include <math.h>

#include <string.h>

#include <algorithm>

using namespace std;

const int MAXN = 5001;

const double eps = 1e-10;

double xs[MAXN], ys[MAXN], zs[MAXN];

double A,B;

int n,m, k;

double ans = 0.0;

void work(){

int r1 = xs[n-1];

int p1 = ys[m-1];

int p2 = zs[0];

ans = B*r1*r1*1.0/(p2*A*1.0/p1 + B*1.0);

ans = sqrt(ans);

cout.precision(12);

cout.setf(ios::fixed,ios::floatfield);

cout<<ans<<endl;

}

int main(){

cin>>n;

for(int i=0; i<n; i++)cin>>xs[i];

cin>>m;

sort(xs,xs+n);

for(int i=0; i<m; i++)cin>>ys[i];

sort(ys,ys+m);

cin>>k;

for(int i=0; i<k; i++)cin>>zs[i];

sort(zs,zs+k);

cin>>A>>B;

work();

return 0;

}