// input macro
// ref: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let mut s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};

    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let mut $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };

    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };

    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };

    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };

    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

fn gcd(a: usize, b: usize) -> usize {
    if a%b == 0 {
        return b;
    }
    else {
        return gcd(b, a%b);
    }
}

fn rec(a: usize, b: usize) -> usize {
    if gcd(a,b) == b {
        return (2 * (a/b) - 1) * b;
    }
    else {
        return 2 * (a/b) * b + rec(b, gcd(a,b)); 
    }
}

#[allow(unused_mut)]
fn main() {
    input!(
        n: usize,
        x: usize,
    );
    let a = std::cmp::max(x, n-x);
    let b = std::cmp::min(x, n-x);

    println!("{}", a+b+rec(a,b));
}
