#include <bits/stdc++.h>
using namespace std;
typedef long double ld;
int main() {
  ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  freopen("secv3.in","r",stdin);
  freopen("secv3.out","w",stdout);
  int n,l,r;
  cin>>n>>l>>r;
  vector<int> c(n),t(n);
  for(auto&x:c)cin>>x;
  for(auto&x:t)cin>>x;
  vector<ld> s(n+1);
  auto isok=[&](ld val) {
    for(int i=0;i<n;i++){
      s[i+1]=s[i]+c[i]-t[i]*val;
    }
    for(int len=l;len<=r;len++){
      for(int i=0;i+len-1<n;i++) {
        if(s[i+len]-s[i]>=0){
          return 1;
        }
      }
    }
    return 0;
  };
  ld low=0,high=1e9;
  for(int it=1;it<=200;it++){
    ld mid=(low+high)/2;
    if(isok(mid)){
      low=mid;
    }else{
      high=mid;
    }
  }
  cout<<fixed<<setprecision(2)<<low<<"\n";
  return 0;
}