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

### Instruction:
How many of the Royal Waggon Train Unit were Missing while having a Killed of 0 off 0 men and a Wounded of 0 off 0 men?

### Inputs:
table_name: table, columns: ['Unit', 'Complement', 'Killed', 'Wounded', 'Missing']

### Response:
SELECT Missing FROM table WHERE Killed = 0 off 0 men AND Wounded = 0 off 0 men AND Unit = royal waggon train