#include<fstream>
#include<vector>
#include<iomanip>

using namespace std;

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

struct Elem {
    int c, t;
    Elem(int a, int b) {c = a; t = b;}
    Elem() {}
};
vector<Elem> S;
vector<double> PREC;
int n, l, u;

Elem sum(const Elem &a, const Elem &b) {
    return Elem(a.c+b.c, a.t+b.t);
}
Elem dif(const Elem &a, const Elem &b) {
    return Elem(a.c-b.c, a.t-b.t);
}

double Sum;
Elem E;
double findMax(int b, int e) {
    if(b == e) {
        Sum = 0;
        for(int i=0; i<=n-b; i++) {
            E = dif(S[i+b], S[i]);
            Sum = max(Sum, (double)E.c/E.t);
        }
    return Sum;
    } else {
        return max(findMax(b, (b+e)/2), findMax((b+e)/2+1, e));
    }
}

int main() {
    fin>>n>>l>>u;
    int c, t;
    S.resize(n+1);
    S[0].c = S[0].t = 0;
    for(int i=1; i<=n; i++) {
        fin>>S[i].c;
        S[i].c += S[i-1].c;
    }
    for(int i=1; i<=n; i++) {
        fin>>S[i].t;
        S[i].t += S[i-1].t;
    }
    Elem e;

    fout<<setprecision(20)<<findMax(l, u);
}