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

using namespace std;

ifstream in("secv3.in");
ofstream out("secv3.out");
int i,j,l,u,n; float v[30001]={0};
float cmm=-1000000;

int main()
{
    in >> n >> l >> u;
    i=1;
    while(in >> v[i])i++;
    i--;
    j=i;
    for(i=1;i<=j/2;i++){
        if(v[i]/v[i+j/2]>cmm)cmm=v[i]/v[i+j/2];
    }
    out << setprecision(2) << cmm;
}