#include <bits/stdc++.h>

using namespace std;

struct mal
{
    int price;
    int weight;
};


bool cmp(struct mal a, struct mal b)
{
    double unitprice1 = (double)a.price / a.weight;
    double unitprice2 = (double)b.price / b.weight;
    return unitprice1 > unitprice2;
}

double buijjhalow(struct mal mals[],int bostarWeight, int n)
{
    sort(mals, mals + n, cmp);

    int w = 0;
    double res = 0.0;


    for (int i = 0; i < n; i++)
    {

        if (w + mals[i].weight <= bostarWeight)
        {
            w += mals[i].weight;
            res += mals[i].price;
        }


        else
        {
            int left = bostarWeight - w;
            res += mals[i].price * ((double) left / mals[i].weight);
            break;
        }
    }

    return res;
}

int main()
{
    int a,n,c;
    cin>>n>>c;
    mal mals[n];
    for(int i=0;i<n;i++){
        cin>>a;
        mals[i].weight=a;
        }
    for(int i=0;i<n;i++){
        cin>>a;
        mals[i].price=a;
        }

     printf("%.2lf\n",buijjhalow(mals,c,n));
        return 0;
}