Connect 5 switches to a single router using fiber

[Xtrastor]

Hi guys, I need a few recommendations.
I need to build the CCTV system (ip cameras) of a small hotel, the hotel has a central building (reception) and 5 other buildings (rooms), the distance between each "room building" and the "central building" is more than 100m away, there are going to be several cameras on each building, those cameras are connected to a switch (every building will have a switch) and I need to connect those 5 switches to a router (central building).
So, I was planning to use fiber cable (because distance is too great for ethernet cable) to connect each switch to a single router, but the problem is that, the router only has 1 SFP port, so...
How could I connect all those switches in this case?, or if you guys have a better idea on how I should connect everything?...
Thanks

PD: I will add a picture of how I thought I should connecting everything.

 

[bill001g]

Buy a switch with at least 5 fiber ports and put in front of your router. A switch will cause no measurable delay in your network.

 

[Xtrastor]

Buy a switch with at least 5 fiber ports and put in front of your router. A switch will cause no measurable delay in your network.

Thanks for you answer.
1. mmm yeah you are right, although I haven't been able to find a store that sells a switch with mutiple SFPs in my country yet.
2. don't you think that maybe having every switch connected to 1 main switch and that main switch connected with only 1 cable to the router could max the cable transfer capacity (or the port max transfer capacity)? (there are going to be 40 IP Cameras total).

 

[bill001g]

What is the router hooked to. It really depends if this is what you most time see on these forums that the router is going to the internet or if this is some enterprise type of install that the router is actually a real router that has many other switches and other equipment hooked to it.

It it is a internet connection then you will likely exceed you internet bandwidth before you exceed the speed of a 1g port. Even if you had some big data server hooked to the router it too would be limited by its single port to the router.

Now if you had some big 10g connected serve hooked to the router you may need a different design. Likely replacing the router or its function with a layer 3 switch that has multiple SFP ports.