#include <iostream>
#include <fstream>
#include <iomanip>

using namespace std;

ifstream fin("secv3.in");
ofstream fout("secv3.out");

int main()
{
    long n,l,u,i,j,k;
    float x,max=0,s1=0,s2=0;
    fin>>n>>l>>u;
    long m[2][n+5];
    for (i=1;i<=n;i++)
        fin>>m[1][i];
    for (i=1;i<=n;i++)
        fin>>m[2][i];
    for (i=l;i<=u;i++)
        for (j=1;j<=n-i+1;j++)
        {
            for (k=j;k<=j+i-1;k++)
            {
                s1+=m[1][k];
                s2+=m[2][k];
            }
            x=s1/s2;
            if (x>max) max=x;
            s1=0;
            s2=0;
        }
    i=max*100;
    if (i%10>=5) fout<<fixed<<setprecision(2)<<max-0.01;
        else fout<<fixed<<setprecision(2)<<max;

    return 0;
}