clustering with weka , help ! ( beginner)

Could you please help me find the size of the largest cluster ?

Class attribute: flightbooking
Classes to Clusters:


0 1 2 <-- assigned to cluster
0 100 0 | senior
8 20 4 | student
0 70 0 | worker


Cluster 0 <-- No class
Cluster 1 <-- student
Cluster 2 <-- No class


Incorrectly clustered instances : 182.0 46.6667 %