fn main() {
    let mut nm = String::new();
    std::io::stdin().read_line(&mut nm).ok();
    let nm: Vec<usize> = nm.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nm[0];
    let m = nm[1];

    if n <= 60 && (1 << (n-1)) <= m {
        println!("{}", (1usize << n) - 1);
        return;
    }
    let mut start = m;
    let mut stack = vec![];
    while stack.len() < n && start > 1 {
        stack.push(start);
        if start & 1 == 1 {
            start = (start+1)/2;
        } else {
            start /= 2;
        }
    }
    let result = stack.iter().sum::<usize>() + (n - stack.len()) * 1;
    println!("{}", result);
}