user: Question: How many samples taken from producer Qingdao Suncare Nutritional Technology with a melamine content less than 53.4?
Columns: ['Producer', 'Product', 'Samples taken', 'Samples failed', 'Melamine content(mg/kg)']
Types: ['text', 'text', 'real', 'real', 'real']
Sample row: ['Shijiazhuang Sanlu Group', '三鹿牌嬰幼兒配方乳粉', 11.0, 11.0, 2563.0]
SQL:

assistant: SELECT SUM("Samples taken") FROM "Table" WHERE "Melamine content(mg/kg)" < 53.4 AND "Producer" = 'Qingdao Suncare Nutritional Technology';