In the pattern you are casting on a total of 220 stitches......
Then, the round reads...
Rnd1: p1, *(k1tbl) three times, p2, rep from * to last 4 sts, k3, p1
The stitches in blue are 5 stitches that are not worked in the pattern.
The stitches in red are the stitches worked in the pattern.
There are 5 stitches in blue so if you take the 220 cast on stitches and subtract 5 you are left with 215 stitches that are worked in the ribbing pattern.