#include <cstdio>
#include <algorithm>
#include <deque>
#define MaxN 30001
#define INF 2000000000
#define time second
#define value first
using namespace std;

pair <int,int> v[MaxN];
int N,U,L;
float Max,S;
deque <int>D;
int main()
{
    freopen("secv3.in","r",stdin);
    freopen("secv3.out","w",stdout);
	scanf("%d%d%d",&N,&L,&U);
	v[0].value=v[0].time=0;
	for(int i=1;i<=N;i++)
		scanf("%d",&v[i].value),v[i].value+=v[i-1].value;
	for(int i=1;i<=N;i++)
		scanf("%d",&v[i].time),v[i].time+=v[i-1].time;
	for(int i=L;i<=N;i++)
		for(int j=i-L;j>=0&&j>=i-U;j--)
		{
			S=v[i].value-v[j].value;
			S/=v[i].time-v[j].time;
			Max=max(Max,S);
		}
	printf("%f",Max);
	return 0;
}