why Console.Read() giving wrong output in following when used instead of Console.ReadLine()

Question

{
static void Main(string[] args)
{Console .WriteLine("count to: ");
int x= Convert.ToInt32(Console.ReadLine());
for(int i=0; i<=x; i++)
{Console .WriteLine(i);
}
}
}

Answer 1

this code has been posted by someone else in a question, i just posted it with some changes to ask different question.

Answer 2

Console.Read() only reads the first character that's you write in the console

Answer 3

but then for one digit no. output should be same, but in above case it is not