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:
| Year | Single | Chart positions\nUSA Billboard Hot Dance Club Play | Chart positions\nPolish Charts | Album |
| --- | --- | --- | --- | --- |
| 2008 | "Fall" | — | 2 | Natalia Lesz |
| 2008 | "Power of Attraction" | 24 | 5 | Natalia Lesz |
| 2008 | "Miss You" | — | — | Natalia Lesz |
| 2009 | "Coś za coś" | — | 1 | That Girl |
| 2010 | "Arabesque" | 53 | — | Natalia Lesz |
| 2010 | "RadioACTIVE" | — | 107 | — |
| 2010 | "That Girl" | — | 7 | That Girl |
| 2012 | "Beat of My Heart" | — | 98 | That Girl |
Question:
what was natalia lesz's most popular song, according to the polish charts?
Answer:
"Coś za coś"