package main
import "fmt"

func roomNumber(num int, slc *[]int){
	for i := 0; i < num; i++{
		var val int
		fmt.Scan(&val)
		*slc = append(*slc, val)
	}
}

func removeDuplicate(args []int) []int{
  results := make([]int, 0, len(args))
  encountered := map[int]bool{}
  for i := 0; i < len(args); i++{
    if !encountered[args[i]] {
      encountered[args[i]] = true
      results = append(results, args[i])
    }
  }
  return results
}

func main(){
	var yuki, transfer, num int
	fmt.Scan(&yuki, &transfer, &num)

	slc := []int{}
	roomNumber(num, &slc)
	duplication := len(slc) - len(removeDuplicate(slc))
	fmt.Println( duplication * (yuki + transfer) )
}