use proconio::input;

fn main() {
    input! {
        n: usize, m: usize,
        sp: [(String, usize); n],
        t: [String; m],
    }

    let ans = t
        .iter()
        .map(|t| sp.iter().find_map(|(s, p)| (s == t).then_some(p)).unwrap())
        .sum::<usize>();
    println!("{ans}");
}