Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Artist | Country | Number-one single(s) | Year | Weeks at #1 | Straight to #1 ? |
| --- | --- | --- | --- | --- | --- |
| Paco | Viet Nam | "Amor de mis amores" | 1988.0 | 5.0 | No |
| Pagny, Florent | France | " N'importe quoi " | 1988.0 | 8.0 | No |
| Pagny, Florent | France | " Savoir aimer " | 1997.0 | 9.0 | No |
| Pagny, Florent | France | " Ma liberté de penser " | 2003.0 | 6.0 | No |
| Pakito | France | " Living on Video " | 2004.0 | 4.0 | No |
| Paradis, Vanessa | France | " Joe le taxi " | 1987.0 | 11.0 | No |
| Parker Jr., Ray | United States | " Ghostbusters " | 1984.0 | 5.0 | No |
| Parker, Tony | France | " Balance-toi " | 2007.0 | 1.0 | Yes |
| Passi | France | " Laisse parler les gens " 1 | 2003.0 | 3.0 | No |
| Patti, Guesch | France | " Étienne " | 1987.0 | 5.0 | No |
| Pep's | France | "Liberta" | 2009.0 | 2.0 | Yes |
| Peter & Sloane | France | "Besoin de rien, envie de toi" | 1984.0 | 9.0 | No |
| Pietri, Julie | France | " Ève lève-toi " | 1986.0 | 1.0 | No |
| Pigloo | France | " Le Papa Pingouin " | 2006.0 | 3.0 | No |
| Pitbull | United States | " I Know You Want Me (Calle Ocho) " | 2009.0 | 8.0 | No |
| Plage, La | France | " Coup de Boule " | 2006.0 | 3.0 | No |
| M. Pokora | France | " Dangerous " | 2008.0 | 1.0 | Yes |
| Pow woW | France | " Le Chat " | 1992.0 | 7.0 | No |
| Product G&B, The | United States | " Maria Maria " 1 | 2000.0 | 4.0 | No |
Question:
What number-one single is performed by artist Pep's?
Answer:
"Liberta"