HCG mixing questions

I figured this out before but I am not exactly sure now because I am using different pins. I have 5 vials of 1500 iu HCG each one comes with 1 ml sterile water. I was planning on mixing all five into a single sterile vial for storage. I am using a 3cc syringe if I wanted to pin 2x250iu per week how much would that measure on a 3cc syringe?

HCG mixing questions