How many breeds of dragons were used in the first challenge Harry Potter and Goblet Fire?

There were four breeds of dragons used in the first task of the Triwizard Tournament in Harry Potter and the Goblet of Fire:

1. Hungarian Horntail: Viktor Krum's dragon.

2. Swedish Short-Snout: Cedric Diggory's dragon.

3. Chinese Fireball: Fleur Delacour's dragon.

4. Common Welsh Green: Harry Potter's dragon.

It's important to note that while each student was assigned a dragon, they didn't necessarily choose the breed. The dragons were randomly assigned to each competitor by the Goblet of Fire.