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:
| Province | Map # | ISO 3166-2:AF | Centers | Population | Area (km²) | Language | Notes | U.N. Region |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Badakhshan | 30 | AF-BDS | Fayzabad | 823,000 | 44,059 | Dari Persian, | Composed of 29 districts | North East Afghanistan |
| Badghis | 4 | AF-BDG | Qala i Naw | 429,500 | 20,591 | Dari Persian, Pashto | 7 districts | West Afghanistan |
| Baghlan | 19 | AF-BGL | Puli Khumri | 779,000 | 21,118 | Dari Persian Uzbek, Turkmen, Pashto | 16 districts | North East Afghanistan |
| Balkh | 13 | AF-BAL | Mazari Sharif | 1,096,100 | 17,249 | Dari Persian, | 15 districts | North Afghanistan |
| Bamyan | 15 | AF-BAM | Bamyan | 387,300 | 14,175 | Dari Persian | 7 districts | East Central Afghanistan |
| Daykundi | 10 | AF-DAY | Nili | 399,600 | 8,088 | Dari Persian | 8 districts\nFormed from Orūzgān Province in 2004 | South West Afghanistan |
| Farah | 2 | AF-FRA | Farah | 438,000 | 48,471 | Pashto, Dari Persian, Baloch | 11 districts | West Afghanistan |
| Faryab | 5 | AF-FYB | Maymana | 858,600 | 20,293 | Dari Persian, Turkmen and Uzbek | 14 districts | West Afghanistan |
| Ghazni | 16 | AF-GHA | Ghazni | 931,000 | 22,915 | Pashto, Dari Persian | 19 districts | South Afghanistan |
| Ghor | 6 | AF-GHO | Chaghcharan | 485,000 | 36,479 | Dari Persian | 10 districts | East Central Afghanistan |
| Helmand | 7 | AF-HEL | Lashkar Gah | 745,000 | 58,584 | Pashto,Baloch | 13 districts | South West Afghanistan |
| Herat | 1 | AF-HER | Herat | 1,182,000 | 54,778 | Dari Persian, Pashto | 15 districts | West Afghanistan |
| Jowzjan | 8 | AF-JOW | Sheberghan | 441,000 | 11,798 | Uzbek, Dari Persian | 9 districts | North Afghanistan |
| Kabul | 22 | AF-KAB | Kabul | 3,314,000 | 4,462 | Pashto, Dari Persian, Turkmen, Baloch and Uzbek | 15 districts | Central Afghanistan |
| Kandahar | 12 | AF-KAN | Kandahar | 886,000 | 54,022 | Pashto, Dari Persian,Baloch | 16 districts | South West Afghanistan |
| Kapisa | 29 | AF-KAP | Mahmud-i-Raqi | 360,000 | 1,842 | Dari Persian | 7 districts | Central Afghanistan |
| Khost | 26 | AF-KHO | Khost | 300,000 | 4,152 | Pashto | 13 districts | South Afghanistan |
| Kunar | 34 | AF-KNR | Asadabad | 321,000 | 4,942 | Pashto | 15 districts | East Afghanistan |
| Kunduz | 18 | AF-KDZ | Kunduz | 820,000 | 8,040 | Dari Persian, Uzbek, Turkmen, Pashto | 7 districts | North East Afghanistan |
| Laghman | 32 | AF-LAG | Mihtarlam District | 373,000 | 3,843 | Pashto, Dari Persian and Pashai | 5 districts | East Afghanistan |
| Lowgar | 23 | AF-LOW | Pul-i-Alam | 292,000 | 3,880 | Dari Persian, Pashto | 7 districts | Central Afghanistan |
| Nangarhar | 33 | AF-NAN | Jalalabad | 1,089,000 | 7,727 | Pashto, Dari Persian | 23 districts | East Afghanistan |
| Nimruz | 3 | AF-NIM | Zaranj | 149,000 | 41,005 | Balochi, Dari Persian and Balochi | 5 districts | South West Afghanistan |
| Nurestan | 31 | AF-NUR | Parun | 112,000 | 9,225 | Nuristani, Pashto, Dari Persian | 7 districts | East Afghanistan |
| Orūzgān | 11 | AF-ORU | Tarin Kowt | 627,000 | 22,696 | Pashto | 6 districts | South West Afghanistan |
| Paktia | 24 | AF-PIA | Gardez | 415,000 | 6,432 | Pashto, Dari Persian | 11 districts | South Afghanistan |
| Paktika | 25 | AF-PKA | Sharan | 352,000 | 19,482 | Pashto | 15 districts | South Afghanistan |
| Panjshir | 28 | AF-PAN | Bazarak | 128,620 | 3,610 | Dari Persian | 5 districts\nCreated in 2004 from Parwan Province | Central Afghanistan |
| Parwan | 20 | AF-PAR | Charikar | 726,000 | 5,974 | Dari Persian | Composed of 9 districts | Central Afghanistan |
| Samangan | 14 | AF-SAM | Aybak | 378,000 | 11,262 | Dari Persian, Uzbek | 5 districts | North Afghanistan |
| Sar-e Pol | 9 | AF-SAR | Sar-e Pol | 468,000 | 15,999 | Dari Persian and Uzbek | 6 districts | North Afghanistan |
| Takhar | 27 | AF-TAK | Taloqan | 810,800 | 12,333 | Dari Persian, and Uzbek | 12 districts | North East Afghanistan |
| Wardak | 21 | AF-WAR | Meydan Shahr | 413,000 | 8,938 | Pashto, Dari Persian | 9 districts | Central Afghanistan |
| Zabul | 17 | AF-ZAB | Qalat | 365,920 | 17,343 | Pashto | 9 districts | South West Afghanistan |
Question:
how many provinces have pashto as one of their languages
Answer:
20