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

### Instruction:
When yidu 宜都 is the commandery what is the lowest number of countries?

### Inputs:
table_name: table, columns: ['Province', 'Provincial capital', 'Commandery', 'Commandery capital', 'No. of counties']

### Response:
SELECT MIN No. of counties FROM table WHERE Commandery = Yidu 宜都