use proconio::input;

fn main() {
    input! {
        n: usize, m: usize,
    }

    let (n, m) = (n.min(m), n.max(m));
    let mut ans = n * m;
    let mut mu = vec![2i8; n + 1];
    for i in 2..=n {
        if mu[i] == 2 {
            for j in (i..=n).step_by(i) {
                mu[j] = match mu[j] {
                    1 | 2 => -1,
                    -1 => 1,
                    0 => 0,
                    _ => unreachable!(),
                }
            }
            for j in (i * i..=n).step_by(i * i) {
                mu[j] = 0;
            }
        }

        if mu[i] == 1 {
            ans += (n / i) * (m / i);
        } else if mu[i] == -1 {
            ans -= (n / i) * (m / i);
        }
    }

    println!("{ans}");
}