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

### Instruction:
How many have the Till Agra of 500?

### Inputs:
table_name: table, columns: ['Vehicle Category', 'Till Aligarh', 'Till Mathura', 'Till Agra', 'For Round Trip']

### Response:
SELECT COUNT Till Mathura FROM table WHERE Till Agra = 500