I want to know the answer to the following question:
How many Greenpeace activists boarded Fennica and Nordica in March 2012?
All the background I'm provided with is that "On 16 March 2012, 52 Greenpeace activists from five different countries boarded Fennica and Nordica, multipurpose icebreakers chartered to support Shell's drilling rigs near Alaska.". Is that enough to answer the question?