All the students of Hongxing Primary School are going to plant trees, organized into groups of 3, 5, and 7. The total number of students in Hongxing Primary School is between 300 and 400. Calculate the number of students in Hongxing Primary School people.
红星小学全校学生去植树，编成3人一组，5人一组，7人一组都能正好分完而没有剩余，红星小学总人数在300～400之间，算一算红星小学有多少人．
<result>315</result>