fn get_factors(n: usize) -> Vec<Vec<usize>> {
    let mut ret = vec![vec![]; n+1];

    for i in 1..=n {
        for j in 1..=n/i {
            ret[i*j].push(i);
        }
    }

    ret
}

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];
    let mut a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let a: Vec<usize> = a.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();

    let mut opened = vec![false; n+1];
    for &v in a.iter() {
        opened[v] = true;
    }
    let mut result = 0usize;
    let mut actual = vec![false; n+1];
    let factors = get_factors(n);
    for i in (1..=n).rev() {
        if actual[i] == opened[i] {
            result += 1;
            continue;
        }
        for &v in factors[i].iter() {
            actual[v] = !actual[v];
        }
    }
    println!("{}", result);
}