use proconio::input;

fn main(){
    input!{
        n: usize,
        m: usize,
        a: [usize; n],
        b: [usize; m],
    }

    let mut ans = 0;
    let mut cnt = vec![0; n];
    for x in a{
        cnt[x-1] += 1;
        if cnt[x-1] > b[x-1]{
            ans += 1;
        }
    }

    println!("{}", ans);
}