Liu Ling reads a book with an average of 103 pages per day. After 15 days of reading, there are 57 pages left. How many pages does this book have?
刘玲读一本书，平均每天读103页，读了15天，还剩57页没读，这本书共有多少页？
<gadget id="calculator">103 * 15</gadget>
<output>1_545</output>

<gadget id="calculator">1_545 + 57</gadget>
<output>1_602</output>

<result>1_602</result>