user: Question:  how many na -350- with title and source being Bokumo Sekai wo Sukuitai: Battle Tournament
Columns: ['Title and Source', 'Developer(s)/Publisher(s)', 'JP -210-', 'NA -350-', 'PAL -295-', 'Wii Points']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['101-in-1 Explosive Megamix', 'Nordcurrent', 'No', 'Yes', 'Yes', '700']
SQL:

assistant: SELECT COUNT("NA -350-") FROM "Table" WHERE "Title and Source" = 'Bokumo Sekai wo Sukuitai: Battle Tournament';