You will be given a definition of a task first, then some input of the task.
This task involves creating answers to complex questions, from a given passage. Answering these questions, typically involve understanding multiple sentences. Make sure that your answer has the same type as the "answer type" mentioned in input. The provided "answer type" can be of any of the following types: "span", "date", "number". A "span" answer is a continuous phrase taken directly from the passage or question. You can directly copy-paste the text from the passage or the question for span type answers. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words. A "number" type answer can include a digit specifying an actual value. For "date" type answers, use DD MM YYYY format e.g. 11 Jan 1992. If full date is not available in the passage you can write partial date such as 1992 or Jan 1992. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words.

Passage: Colombia has well-developed air routes and an estimated total of 984 airports, 100 of which have paved runways, plus two heliports. Of the 74 main airports, 20 can accommodate jet aircraft. Two airports are more than 3,047 meters in length, nine are 2,4383,047 meters, 39 are 1,5242,437 meters, 38 are 9141,523 meters, 12 are shorter than 914 meters, and 880 have unpaved runways. The government has been selling its stake in local airports in order to allow their privatization. The country has 40 regional airports, and the cities of Bogota, Medellin, Cali, Barranquilla, Bucaramanga, Cartagena, Cucuta, Leticia, Pereira, San Andres, and Santa Marta have international airports. Bogotas El Dorado International Airport handles 550 million metric tons of cargo and 22 million passengers a year, making it the largest airport in Latin America in terms of cargo and the third largest in passenger numbers.
Question: How many of the main 74 airports cannot accommodate jet aircrafts?
Answer type: Number
Output:
54.