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

### Instruction:
What is the sum of Game, when High Points is "D. McKey (24)", and when Team is "@ Dallas Mavericks"?

### Inputs:
table_name: table, columns: ['Game', 'Date', 'Team', 'Score', 'High points', 'High rebounds', 'High assists', 'Location Attendance', 'Record']

### Response:
SELECT SUM Game FROM table WHERE High points = d. mckey (24) AND Team = @ dallas mavericks