The Fuguiniao shoe store came in with 400 pairs of leather shoes. (1/5) of the total amount sold in the first week, and (3/8) of the total amount sold in the second week. How many pairs are left unsold?
富贵鸟鞋店进来皮鞋400双．第一周卖出总数的(1/5)，第二周卖出总数的(3/8)．还剩多少双没有卖出？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (1/5) - (3/8)</gadget>
<output>17/40 = around 0.425</output>

<gadget id="calculator">400 * (17/40)</gadget>
<output>170</output>

<result>170</result>