#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int, int>;
const long long INF = 1001001001;
const long long MOD = 1000000007;
const double EPS = 1e-10;

ll n,d,sum;

ll f(ll x){
    return (x*sum>=d);
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    cin>>n>>d;
    ll x[n],u[n];
    for(int i=0;i<n;i++)cin>>x[i];
    for(int i=0;i<n;i++)cin>>u[i],sum+=u[i];
    ll lb=0,ub=1001001001001;
    while(ub-lb>1){
        ll md=(ub+lb)/2;
        if(f(md))ub=md;
        else lb=md;
    }
    cout<<ub<<endl;
}