use std::io::*;
use std::str::FromStr;

#[allow(dead_code)]
fn get_line() -> String {
    let stdin = stdin();
    let mut line = String::new();
    stdin.lock().read_line(&mut line).expect("io error.");
    line.trim().to_string()
}

#[allow(dead_code)]
fn cast<T: FromStr>(s: &str) -> T {
    s.parse().ok().expect("parse error.")
}

#[allow(dead_code)]
fn get_vec<T: FromStr>() -> Vec<T> {
    (&get_line()).split(' ').map(cast::<T>).collect()
}


/* ---------- ここまでテンプレ ---------- */


fn main() {
    let p = cast::<u64>(&get_line()) + cast::<u64>(&get_line());
    let n: u64 = cast(&get_line());

    let mut cnt = [0u64; 1000];

    for _ in 0..n {
        let r: usize = cast(&get_line());
        cnt[r] += 1;
    }

    let mut ans = 0;
    for i in 1..1000 {
        if cnt[i] > 1 {ans += (cnt[i] - 1) * p};
    }

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