Xiao Ming sees that his classmate in the front is at (3, 5) in the square array, and turns his head to see that the classmate directly behind him is at (6, 4). How many people are there in the square where he is.
小明在方阵中看他最正前方的同学位置是(3，5)，扭头看他正后方的同学在(6，4)，他所在的这个方阵共有多少人．
<gadget id="calculator">5 + 4 + 1</gadget>
<output>10</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<result>80</result>