紧急求助!VENN DIAGRAM的问题.谢谢先.

The group of 24 students visited a cheese factory in Michigan. They got to taste 3 kinds of cheeses.
17 like Colby(C).
11 like Gouda(G).
18 like Swiss(S).
8 like both C and G.
8 like both G and S.
12 like both S and C.
1 like none of the three.
How many liked only 1 of the 3 cheeses?