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

    if n == 1 {
        println!("1");
        return;
    }
    if k == n-1 {
        println!("{}", n);
        return;
    }
    println!("{}", n-1);
}