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

### Instruction:
Tell me the total number of crest length for year construction larger than 1957 for mattmark

### Inputs:
table_name: table, columns: ['Name', 'Canton', 'Height (meters)', 'Crest length (meters)', 'Type', 'Year of construction', 'Name of the Lake']

### Response:
SELECT COUNT Crest length (meters) FROM table WHERE Year of construction > 1957 AND Name = mattmark