require 'openssl'
def password(secret, offset = 0)
  digest = OpenSSL::HMAC.digest("sha1", [secret].pack("H*"), [(Time.now.to_i - offset) / 30].pack("xxxxN"))
  (digest[digest[19] & 0x0F, 4].unpack("N").first & 0x7FFFFFFF) % (10 ** 8)
end

puts password ARGV[0]