from strutils import parseInt

let
  P1 = parseInt(readLine(stdin))
  P2 = parseInt(readLine(stdin))
  N  = parseInt(readLine(stdin))

var
  R: array[0..99, int]
  ans = 0

for i in countup(0, N - 1):
  R[i] = parseInt(readLine(stdin))

  for j in countup(0, i - 1):
    if R[i] == R[j]:
      ans += P1 + P2
      break

echo ans