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

### Instruction:
How many branches have radio electrical=hon s lt(r)?

### Inputs:
table_name: table, columns: ['Serial & Branch', 'Seaman', 'Mechanical', 'Secretariat', 'Supply', 'Electrical', 'Radio Electrical', 'Regulating', 'Medical']

### Response:
SELECT COUNT Serial & Branch FROM table WHERE Radio Electrical = Hon S Lt(R)