user: Question: How many copies were sold when the 1st week sales were 4,590+?
Columns: ['Year', 'Album', 'Oricon position', '1st week sales', 'Copies sold']
Types: ['real', 'text', 'real', 'text', 'text']
Sample row: [1988.0, "B'z Release date: September 21, 1988", 47.0, '3,790+', '338,360+']
SQL:

assistant: SELECT "Copies sold" FROM "Table" WHERE "1st week sales" = '4,590+';