>I'm gonna convert it to an int.
>
>There will always be a number in this position.
>
>
>>>

string s = "+OK 1 2729"

>>>
>>>How do I parse the '1' from the above string?
>>
>>What do you want to do with it? Remove it? Obtain the value that is always in that space?

Depending on what the string can look like, this may work:

string s = "+OK 1 2729"
string num = s.Substring(4, s.IndexOf(" ", 4) - 3);
int result;
int.TryParse(num, out result);