n, l, h = gets.chomp.split.map(&:to_i)
c = gets.chomp.split.map(&:to_i)

if c.count(1) == 1
  if c.size == 1
    puts(h-l+1) 
    exit
  end
elsif c.count(1) > 1
  puts 0
  exit
end

answerCount = 0

l.upto(h) do |i|
  disCount = 0
  0.upto(n-1) do |j|
    if i % c[j] == 0
      disCount += 1
    end
  end
  if disCount == 1
    answerCount += 1
  end
end

puts answerCount