How many cycling world championships has Peter Sagan won?
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
How many cycling world championships has Peter Sagan won?

### Input:
Sagan is considered one of cycling's greatest talents, having earned many prestigious victories,[9][10] including three consecutive World Championships, one European Championship, two Paris–Nice stages, seven Tirreno–Adriatico stages, one in the Tour de Romandie, three and the overall classification in the Tour de Pologne, a record seventeen stages and the overall in the Tour of California,[11] and another fifteen in the Tour de Suisse.

### Response:

Sagan is considered one of cycling's greatest talents, having earned many prestigious victories,[9][10] including three consecutive World Championships, one European Championship, two Paris–Nice stages, seven Tirreno–Adriatico stages, one in the Tour de Romandie, three and the overall classification in the Tour de Pologne, a record seventeen stages and the overall in the Tour of California,[11] and another fifteen in the Tour de Suisse.
Sagan has won three consecutive cycling world championships