import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        PrintWriter out = new PrintWriter(System.out);
        FastScanner sc = new FastScanner();
        Strategy strategy = new MyStrategy();
        strategy.solve(out, sc);
        out.flush();
    }
}

class MyStrategy implements Strategy {
    @Override
    public void solve(PrintWriter out, FastScanner sc) {
        int N = sc.nextInt();
        long X = sc.nextLong();
        long cntP = calculateCnt(X, N);
        out.println(cntP);
    }

    private long calculateCnt(long X, int i) {
        if (i == 1) {
            if (X == 1) {
                return 0;
            } else if (X <= 4) {
                return X-1;
            } else if (X == 5){
                return 3;
            } else {
                throw new RuntimeException();
            }
        }
        long half = lenBurger(i-1) + 1;
        if (X <= 1) {
            return 0;
        } else if (X < half) {
            return this.calculateCnt(X-1, i-1);
        } else if (X == half) {
            return countP(i-1);
        } else if (X == half + 1) {
            return 1 + countP(i-1);
        } else if (X <= 2 * half) {
            return 1 + countP(i-1) + this.calculateCnt(X-(half+1), i-1);
        } else if (X == 2 * half + 1) {
            return countP(i);
        } else {
            throw new RuntimeException();
        }
    }

    private long lenBurger(int i) {
        return (long) Math.pow(2, i+2) - 3;
    }

    private long countP(int i) {
        return (long) Math.pow(2, i+1) - 1;
    }
}

interface Strategy {
    void solve(PrintWriter out, FastScanner sc);
}

class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() { return Double.parseDouble(next());}
}


Measured memory_bytes: 21332