P1 = gets.to_i
P2 = gets.to_i
N = gets.to_i
R = N.times.map { gets.to_i }

checked = Hash.new(false)
profit = 0
debt = 0

R.each do |r|
  if checked[r]
    debt += P1 + P2
  else
    profit += P1
  end

  checked[r] = true
end

puts debt