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

### Instruction:
What's Sara Isakovič's lane number that had a heat of 3?

### Inputs:
table_name: table, columns: ['Heat', 'Lane', 'Name', 'Nationality', 'Time']

### Response:
SELECT SUM Lane FROM table WHERE Heat = 3 AND Name = sara isakovič