Yes, MS-0, but then you would have no 4th year to do audition electives, if you wanted to do something that isn't primary care, and which doesn't have a corresponding MS-3 clerkship.
Compress the preclinical curriculum to 1.5 years like Duke, Penn, Vanderbilt, etc. have already done and compress 3rd year to 0.5 years. I don't want to do peds or obgyn so why waste my time on peds and obgyn clerkships?