Under free trade, the quantity of smartphones produced by local producers in Country A is 12390 per year and the quantity of smartphones bought in Country A is 79422 per year. After the imposition of an import quota of X units per year, the quantity of smartphones produced by local producers in the aforementioned country is 41779 per year and the quantity of smartphones bought in the aforementioned country is 66994 per year. What is the value of X?