#include <bits/stdc++.h>
using namespace std;
#define accelerate ios::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define endl "\n";
#define mod 12345
#define ll long long
#define PII pair<int,int>
#define INF 0x3f3f3f3f
const int N=1e2+10;
ll n,m,k,x,y,T;
int main(){
	accelerate;
	cin>>n>>m;
	ll ans=0;
	ans+=m/n;
	x=m/n;
	while(x>=2){
		ans+=x/2;
		x=x-x/2*2+x/2;
	}
	cout<<ans;
	return 0;
}