The music department needs to secure buses for a field trip. Listed below are the total of participants in each of the band, choir, and orchestra.

- 60 students play in the band.
- 70 students sing in the choir.
- 50 students play in the orchestra.
- 12 students are in the band and orchestra.
- 10 students are in the band and choir.
- 5 students are in the choir and orchestra.
- 3 students are in the band, choir, and orchestra

How many students participated only in choir?

students