The `depth` of an integer `n` is defined to be how many multiples of `n` it is necessary to compute before all `10` digits have appeared at least once in some multiple. 
example:
```
let see n=42
Multiple         value         digits     comment
42*1              42            2,4 
42*2              84             8         4 existed
42*3              126           1,6        2 existed
42*4              168            -         all existed
42*5              210            0         2,1 existed
42*6              252            5         2 existed
42*7              294            9         2,4 existed
42*8              336            3         6 existed 
42*9              378            7         3,8 existed
```
Looking at the above table under `digits` column you can find all the digits from `0` to `9`, Hence it required `9` multiples of `42` to get all the digits. So the depth of `42` is `9`. Write a function named `computeDepth` which computes the depth of its integer argument.Only positive numbers greater than zero will be passed as an input.
def compute_depth(n):
    i = 0
    digits = set()
    while len(digits) < 10:
        i += 1
        digits.update(str(n * i))
    return i
def compute_depth(n):
    i = 0
    digits = set()
    while len(digits) < 10:
        i += 1
        digits.update(str(n * i))
    return i