A basket of eggs, 3 pieces of 3 lands, one more at the end; 5 of 5 lands, and one more at the end. How many blue eggs are there at least?
一篮鸡蛋，3个3个地数，最后多1个；5个5个地数，最后还是多1个．这蓝鸡蛋至少有多少个？
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<result>16</result>