Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many sales had a peak position more than 2 and a Certification of 3x platinum?

### Inputs:
table_name: table, columns: ['Rank', 'Artist', 'Album', 'Peak position', 'Sales', 'Certification']

### Response:
SELECT COUNT Sales FROM table WHERE Peak position > 2 AND Certification = 3x platinum