In 2021, Mason, Incorporated reported net sales of $289,980, cost of goods sold of $15,520, depreciation expense of $19,700, net accounts receivable of $29,200, returns and allowances of $2,690, and taxes of $11,550. What were Mason's gross sales in 2021? Record your answer as a whole number without a dollar sign or commas. For example, record $23,456 as 23456