use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: usize = itr.next().unwrap().parse().unwrap();
    let m: usize = itr.next().unwrap().parse().unwrap();
    let x: usize = itr.next().unwrap().parse().unwrap();
    let mut a = vec![0; n];
    let mut b = vec![0; n];
    let mut g = vec![Vec::new(); m + 1];
    let mut costs = Vec::new();
    for i in 0..n {
        a[i] = itr.next().unwrap().parse().unwrap();
        b[i] = itr.next().unwrap().parse::<usize>().unwrap() - 1;
        g[b[i]].push(a[i]);
    }
    for i in 0..m {
        if g[i].len() > 0 {
            g[i].sort_by_key(|&x| std::cmp::Reverse(x));
            g[i][0] += x;
            for j in 0..g[i].len() {
                costs.push(g[i][j]);
            }
        }
    }
    costs.sort_by_key(|&x| std::cmp::Reverse(x));
    for i in 1..costs.len() {
        costs[i] += costs[i - 1];
    }

    let k: usize = itr.next().unwrap().parse().unwrap();
    let mut ans = 0;
    for _ in 0..k {
        let c: usize = itr.next().unwrap().parse().unwrap();
        if c == 0 {
            continue;
        }
        ans += costs[std::cmp::min(costs.len(), c) - 1];
    }
    println!("{}", ans);
}