fn calc(t: usize) -> usize {
    let mut s = 0usize;
    let mut t = t;
    while t > 0 {
        s += t;
        t /= 2;
    }
    s
}

fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();

    let mut lower = 0usize;
    let mut upper = 1e9 as usize;
    while upper > lower {
        let middle = (upper + lower) / 2;
        let val = calc(middle);
        if val == n {
            println!("YES");
            return;
        } else if val > n {
            upper = middle;
        } else {
            lower = middle+1;
        }
    }
    if calc(upper) == n {
        println!("YES");
    } else {
        println!("NO");
    }
}