The fine-tuning of the universe

The universe contains x atoms. If the universe had one less atom, or one more atom, then the universe would be different. If the universe would be different, then maybe life would be impossible in it. It is quite an extraordinary coincidence that the universe has exactly x atoms, and any small variation in the number of atoms means that perhaps life would not be possible. I must conclude the universe was finely-tuned by an intelligent designer.