The seat numbers in the school lecture hall are all composed of an English letter and a number, and the letter is in the front and the number is in the back. It is known that 26 English letters are used to compile these numbers, and the numbers 1-30 are used at the same time. How many seats are there in this theater?
学校报告厅的座位号码都是由一个英文字母和一个数组成的，并且都是字母在前，数在后．已知编这些号码一共用了26个英文字母，同时又用了1-30这些数，这个剧场有多少个座位．
<gadget id="calculator">26 * 30</gadget>
<output>780</output>

<result>780</result>