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:
| Season | Competition | Round | Opponent | Home | Away | Agg. |
| --- | --- | --- | --- | --- | --- | --- |
| 1964–65 | Inter-Cities Fairs Cup | R1 | Everton | 2–5 | 2–4 | 4–9 |
| 1965–66 | Inter-Cities Fairs Cup | R2 | Hearts | 1–3 | 0–1 | 1–4 |
| 1966–67 | European Cup | R1 | 17 Nëntori Tirana | N/A | N/A | Bye |
| 1966–67 | European Cup | R2 | Linfield | 1–4 | 1–1 | 2–5 |
| 1975–76 | UEFA Cup | R1 | Athlone Town | 1–1 | 1–3 | 2–4 |
| 1981–82 | Cup Winners' Cup | R1 | Legia Warszawa | 2–2 | 1–4 | 3–6 |
| 1982–83 | European Cup | PR | Dinamo Bucureşti | 2–1 | 1–3 | 3–4 |
| 1984–85 | European Cup | R1 | Sparta Prague | 3–3 | 0–2 | 3–5 |
| 1985–86 | European Cup | R1 | Zenit Leningrad | 0–2 | 0–2 | 0–4 |
| 1986–87 | UEFA Cup | R1 | Beveren | 0–0 | 0–1 | 0–1 |
| 1998–99 | Cup Winners' Cup | R1 | Rapid Bucureşti | 0–0 | 2–2 | 2–2 (a) |
| 1998–99 | Cup Winners' Cup | R2 | Beşiktaş | 1–0 | 3–3 | 4–3 |
| 1998–99 | Cup Winners' Cup | QF | Chelsea | 2–3 | 0–3 | 2–6 |
| 1999–2000 | Intertoto Cup | R1 | FK Ventspils | 1–0 | 0–2 | 1–2 |
| 2003–04 | UEFA Cup | R1 | Grazer AK | 0–0 | 1–1 | 1–1 (a) |
| 2003–04 | UEFA Cup | R2 | Wisła Kraków | 0–0 | 0–0 | 0–0 (4–3 p) |
| 2003–04 | UEFA Cup | R3 | Newcastle United | 1–1 | 1–3 | 2–4 |
| 2005–06 | Champions League | QR2 | Haka | 1–0 | 4–1 | 5–1 |
| 2005–06 | Champions League | QR3 | Club Brugge | 1–0 | 0–1 | 1–1 (3–4 p) |
| 2005–06 | UEFA Cup | R1 | Steaua Bucureşti | 0–3 | 1–3 | 1–6 |
| 2006–07 | Champions League | QR2 | Mladá Boleslav | 2–2 | 1–3 | 3–5 |
| 2007–08 | UEFA Cup | QR1 | Flora Tallinn | 1–0 | 1–0 | 2–0 |
| 2007–08 | UEFA Cup | QR2 | Ekranas | 6–0 | 1–1 | 7–1 |
| 2007–08 | UEFA Cup | R1 | Austria Wien | 2–2 | 0–2 | 2–4 |
| 2009–10 | Europa League | QR3 | PAOK | 1–2 | 1–0 | 2–2 (a) |
| 2011–12 | Europa League | QR2 | Mika | 1–0 | 1–0 | 2–0 |
| 2011–12 | Europa League | QR3 | PAOK | 0–2 | 0–3 | 0–5 |
Question:
how many european cups has this team been a part of?
Answer:
4