The language teacher counts the students' reading of world classics. Among the students in the class, (1/2) read one book, (1/5) read two books, (1/8) read three books, (1/10) read four books, and the students in this class do not exceed With 50 students, how many students in the class have not read a single masterpiece?
语文老师统计学生读世界名著的情况．全班学生中有(1/2)读了一本，(1/5)读了两本，(1/8)读了三本，(1/10)读了四本，这个班学生不超过50人，全班学生中一本名著也没有读的有多少人？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">40 * (1/2)</gadget>
<output>20</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 * (1/5)</gadget>
<output>8</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">40 * (1/8)</gadget>
<output>5</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">40 * (1/10)</gadget>
<output>4</output>

<gadget id="calculator">20 + 8 + 5 + 4</gadget>
<output>37</output>

<gadget id="calculator">40 - 37</gadget>
<output>3</output>

<result>3</result>