Xiao Ming, Wang Ping, and Li Hao are philatelists. One day, the three of them appreciate the collection results of the three of them together. Xiao Ming said: I counted the three of us and collected 280 stamps. (1/3), Wang Ping said: I collected the sum of the two of you (2/5), how many pieces did Li Hao collect?
小明、王平、李好3人是集邮爱好者，一天3人在一块儿欣赏3人的收集成果小明说：我数了数我们3人共收集了280张，我收集的是你们两人和的(1/3)，王平说：我收集的是你们两人和的(2/5)，李好收集了多少张？
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 + 5</gadget>
<output>7</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (1/4) - (2/7)</gadget>
<output>13/28 = around 0.464286</output>

<gadget id="calculator">280 * (13/28)</gadget>
<output>130</output>

<result>130</result>