#![allow(non_snake_case, unused_imports)]

use std::collections::{BinaryHeap, HashMap, HashSet};
use ac_library::{Additive, Min, Segtree};
use proconio::{input, marker::Usize1, marker::Chars};
use itertools::Itertools;

#[allow(unused_macros)]
macro_rules! d {
    ( $( $x:expr ),* $(,)? ) => {
        eprintln!(
            concat!( $( stringify!($x), "={:?} " ),* ),
            $( $x ),*
        );
    };
}

#[allow(dead_code)]
fn yn(b: bool) -> &'static str {
    if b { "Yes" } else { "No" }
}

fn main() {
    input! {
        N: usize,
        M: usize,
        A: [Usize1; N],
        B: [usize; M],
    }

    let freq = A.iter().counts();
    let ans = freq.iter()
        .map(|(&k, &v)| {
            v.saturating_sub(B[*k])
        })
        .sum::<usize>();

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