#include <fstream>
#include <iomanip>
#include <deque>
#define int long long
using namespace std;

ifstream cin("secv3.in");
ofstream cout("secv3.out");

double v[30005];
double d[30005];

deque <int> dq;

signed main()
{
    double mx=0;
    int n, l, r, a;
    cin>>n>>l>>r;
    for(int i=1; i<=n; i++)
    {
        cin>>v[i];
        v[i]+=v[i-1];
    }
    for(int i=1; i<=n; i++)
    {
        cin>>d[i];
        d[i]+=d[i-1];
    }
    for(int k=l; k<=r; k++)
    {
        dq.clear();
        mx=max(mx, v[k]/d[k]);
        for(int i=k; i<n; i++)
        {
            while(!dq.empty() && dq.front()<=i-k)
            {
                dq.pop_front();
            }
            while(!dq.empty() && (v[dq.back()]-v[dq.front()-k])/(d[dq.back()]-d[dq.front()-k])<(v[i]-v[i-k])/(d[i]-d[i-k]))
            {
                dq.pop_back();
            }
            dq.push_back(i);
            mx=max(mx, (v[dq.back()]-v[dq.front()-k])/(d[dq.back()]-d[dq.front()-k]));
        }
    }
    cout<<fixed<<setprecision(2)<<mx;

    return 0;
}