2 Case Fans 1 Sys_fan

[Protolate]

I have two case fans, but only one sys_fan on my motherboard. The case fans are both 3 pin and the motherboard is 4 pin. What splitter should I use to connect them? I think the mobo is male and the fans are female

 

[CountMike]

Any splitter cable, even if it's only 3pin.