loss = gets.chomp.to_i + gets.chomp.to_i
rooms = []
gets.chomp.to_i.times { rooms << gets.chomp }
n = 0
rooms.group_by { |r| r }.reject { |k,v| v.one? }.each { |k,v| n += v.count - 1 }
puts n > 0 ? loss * n : 0