There are 50 students in Class 3 and 2 of Hope Primary School. If you want to participate in the school gymnastics team performance, at least how many students must not be able to participate.
希望小学三2班有50名同学，如果要参加学校体操方队表演，至少要有多少名同学不能参加．
<gadget id="calculator">7 * 7</gadget>
<output>49</output>

<gadget id="calculator">50 - 49</gadget>
<output>1</output>

<result>1</result>