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:
| Electoral District | Registered voters | Seats in Congress | Candidates per party | Participating parties | Total candidates |
| --- | --- | --- | --- | --- | --- |
| Amazonas | 179331.0 | 2.0 | 3.0 | 17.0 | 47.0 |
| Ancash | 611881.0 | 5.0 | 5.0 | 21.0 | 99.0 |
| Apurímac | 195954.0 | 2.0 | 3.0 | 21.0 | 55.0 |
| Arequipa | 770535.0 | 5.0 | 5.0 | 21.0 | 101.0 |
| Ayacucho | 306662.0 | 3.0 | 3.0 | 20.0 | 58.0 |
| Cajamarca | 721239.0 | 5.0 | 5.0 | 23.0 | 109.0 |
| Callao | 541730.0 | 4.0 | 4.0 | 24.0 | 92.0 |
| Cusco | 643629.0 | 5.0 | 5.0 | 22.0 | 98.0 |
| Huancavelica | 203844.0 | 2.0 | 3.0 | 15.0 | 39.0 |
| Huánuco | 354416.0 | 3.0 | 3.0 | 22.0 | 65.0 |
| Ica | 451197.0 | 4.0 | 5.0 | 22.0 | 88.0 |
| Junín | 701190.0 | 5.0 | 5.0 | 22.0 | 99.0 |
| La Libertad | 942656.0 | 7.0 | 7.0 | 22.0 | 145.0 |
| Lambayeque | 676735.0 | 5.0 | 5.0 | 22.0 | 101.0 |
| Lima | 6063109.0 | 35.0 | 35.0 | 24.0 | 738.0 |
| Loreto | 416419.0 | 3.0 | 3.0 | 22.0 | 60.0 |
| Madre de Dios | 47742.0 | 1.0 | 3.0 | 14.0 | 35.0 |
| Moquegua | 99962.0 | 2.0 | 3.0 | 18.0 | 44.0 |
| Pasco | 135670.0 | 2.0 | 3.0 | 17.0 | 51.0 |
| Piura | 914912.0 | 6.0 | 6.0 | 23.0 | 136.0 |
| Puno | 674865.0 | 5.0 | 5.0 | 23.0 | 106.0 |
| San Martín | 357124.0 | 3.0 | 3.0 | 17.0 | 47.0 |
| Tacna | 172427.0 | 2.0 | 3.0 | 18.0 | 57.0 |
| Tumbes | 110335.0 | 2.0 | 3.0 | 19.0 | 57.0 |
| Ucayali | 201342.0 | 2.0 | 3.0 | 22.0 | 60.0 |
Question:
What is the number of participating parties when registered voters totaled 643629?
Answer:
1.0