There is a group of children, the number of 3 is 3 more than 1, the number of 5 and 5 is 3 more, and the number of 7 and 7 is 5 more. How many children are there at least in this group?
有一群小孩，3个3个地数多1个，5个5个地数多3个，7个7个地数多5个，这群小孩至少有多少个．
<gadget id="calculator">105 - 2</gadget>
<output>103</output>

<result>103</result>