A number 3, 5, and 7 are divided by 1 respectively. What is the smallest number?
一个数3、5、7分别除都余1，这个数最小是多少．
<gadget id="calculator">3 * 5 * 7</gadget>
<output>105</output>

<gadget id="calculator">105 + 1</gadget>
<output>106</output>

<result>106</result>