#include<cstdio>
#include<algorithm>
#include<cmath>
using namespace std;
struct MoonCake{
	double ton;//只说是正数 没说是正整数
	double price;
	double one;
}mc[1010];
bool cmp(MoonCake a,MoonCake b){
	return a.one>b.one;
}
int main(){
	int n;
	double d;
	scanf("%d%lf",&n,&d);
	for(int i=0;i<n;i++){
		scanf("%lf",&mc[i].ton);
	}
	for(int i=0;i<n;i++){
		scanf("%lf",&mc[i].price);
	}
	for(int i=0;i<n;i++){
		mc[i].one=mc[i].price/mc[i].ton;
	}
	sort(mc,mc+n,cmp);
	double count=0;
//	int i=0;
//	while(d>0)//浮点数的精度问题？
	for(int i=0;i<n;i++){
		if(d>=mc[i].ton){
			d-=mc[i].ton;
			count+=mc[i].price;
		}else{
			count+=mc[i].one*d;
			break;
//			d=0;
		}
//		i++;
	}
	printf("%.2f",count);
}```