#include <bits/stdc++.h>
using namespace std;

int main()
{
#ifndef LOCAL
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    freopen("secv3.in", "r", stdin);
    freopen("secv3.out", "w", stdout);
#endif

    int N, L, U;
    cin >> N >> L >> U;

    vector<int> c(N + 2, 0), t(N + 2, 0);
    for(int i = 1; i <= N; ++i)
        cin >> c[i];
    for(int i = 1; i <= N; ++i)
        cin >> t[i];

    vector<int> sc(N + 2, 0), st(N + 2, 0);
    for(int i = 1; i <= N; ++i) {
        sc[i] = sc[i-1] + c[i];
        st[i] = st[i-1] + t[i];
    }

    double maxx = 0.0;
    deque<int> dq;
    for(int i = L; i <= N; ++i) {
        while(!dq.empty() && i - dq.front() > U)
            dq.pop_front();
        while(!dq.empty() && sc[dq.back()] - maxx * st[dq.back()] > sc[i-L] - maxx * st[i-L])
            dq.pop_back();
        dq.push_back(i - L);

        double r = (double)(sc[i] - sc[dq.front()]) / (double)(st[i] - st[dq.front()]);
        maxx = max(r, maxx);
    }

    cout << fixed << setprecision(2) << maxx;

    return 0;
}