The teacher asks the students to write a two-digit number with the two numbers 1 and 2. Among the 8 students, at least how many students write the same number.
老师要求学生用1和2这两个数字写一个两位数，8个学生中，至少有多少个学生写的数相同．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<result>4</result>