How many stops from Beijing South Railway Station to XUANWUMEN MTR Station and then to Jianguomen?

Hi!I am very sorry to ask you the specific details in using the Subway Station. It is my joy to be guided accordingly. I will be arriving BSRS and then will take Subway Train. Based on the recent inquiry, I have to take Line 4 first then get off ,after which transfer to Line 2. How many stops from those respective locations? It is an honor to have your support. Have a great time. Be blessed to help others.