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:
| Team 1 | Agg. | Team 2 | 1st leg | 2nd leg |
| --- | --- | --- | --- | --- |
| England | 2–3 | France | 1–1 | 1–2 |
| Czech Republic | 0–3 | Germany | 0–2 | 0–1 |
| Hungary | 1–2 | Italy | 1–1 | 0–1 |
| Serbia and Montenegro | 5–2 | Croatia | 3–1 | 2–1 |
| Ukraine | 5–4 | Belgium | 2–3 | 3–1 |
| Russia | 1–4 | Denmark | 0–1 | 1–3 |
| Switzerland | 2–3 | Portugal | 1–1 | 1–2 |
| Slovenia | 0–2 | Netherlands | 0–0 | 0–2 |
Question:
how many different countries participated?
Answer:
17