brick factory produces 150,000 yellow bricks in the first month, 144,000 yellow bricks in the second month, and 140,000 yellow bricks in the third month. How many yellow bricks were produced in the first quarter?
一个砖厂，第一个月生产黄砖150000块，第二个月生产黄砖144000块，第三个月生产黄砖140000块，第一季度一共生产黄砖多少块？
<result>4_340_000</result>