A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results were as follows:

Question

26 said they drove alone.
34 rode in a carpool.
34 rode public transportation.
7 used both carpools and public transportation.
6 used both a carpool and sometimes their own cars.
5 used buses as well as their own cars.
3 used all three methods.
How many used none of the above-mentioned means of transportation?
1 students