A natural number has a remainder of 1 when divided by 2 and a remainder of 1 when divided by 3. What is the minimum number of this number?
一个自然数，被2除余1，被3除也余1，这个数最小是多少．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<result>7</result>