Here's why you might think there are only three:
* Saturn: Saturn is the most famous ringed planet. Its rings are incredibly bright and complex, but they are made up of countless smaller rings. We often see them depicted as three main bands, but there are many more that are harder to see.
* Jupiter, Uranus, and Neptune: These planets also have ring systems, but they are much fainter than Saturn's. You would need powerful telescopes to see them, and even then, they might appear as thin, faint bands.
So, the answer is that there is no planet with only three rings that are visible. All planets with rings have far more than three.