package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	sc.Scan()
	p1, _ := strconv.Atoi(sc.Text())
	sc.Scan()
	p2, _ := strconv.Atoi(sc.Text())
	sc.Scan()
	n, _ := strconv.Atoi(sc.Text())
	r := make(map[int]int, n)
	loss := 0
	for i := 0; i < n; i++ {
		sc.Scan()
		t, _ := strconv.Atoi(sc.Text())
		if r[t] >= 1 {
			loss += p1 + p2
		}
		r[t]++
	}
	fmt.Println(loss)
}