After graduating from elementary school, classmates will give each other a souvenir. There are 45 students in a class. How many souvenirs are needed in total?
小学毕业，同学之间相互赠送一份纪念品，某班有45名学生，总共需要多少份纪念品．
<gadget id="calculator">44 * 45</gadget>
<output>1_980</output>

<result>1_980</result>