#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)
#define Inf 1000000001


int main(){
	
	long long n,m;
	cin>>n>>m;
	long long T;
	if(n>=32)T = m+1;
	else{
		T = 1;
		rep(i,n-1){
			T *= 2;
		}
	}
	long long ans = 0LL;
	if(T <= m){
		long long cur = 1LL;
		rep(i,n){
			ans += cur;
			cur *= 2;
		}
	}
	else{
		long long remain = n;
		long long cur = m;
		while(cur!=1){
			ans += cur;
			cur = (cur+1)/ 2;
			remain--;
		}
		ans += remain;
		
	}
	cout<<ans<<endl;
	
	return 0;
}