I recommend you to use the simplest input you have.
1. For a line with one number just use

int.Parse(Console.ReadLine())

2. For a line with two numbers use the simplest parser

string query = Console.ReadLine();
int separator = query.IndexOf(' ');
int a = int.Parse(query.Substring(0, separator)) - 1,
b = int.Parse(query.Substring(separator + 1)) - 1;

Otherwise you 'll get TL.

P.S. Does anybody know a faster input?