The seven teams planted a total of 100 trees, and the number of trees planted by each team was different. Among them, the team that planted the most trees planted 18 trees, and the team that planted the fewest trees planted at least how many trees.
七个小队共种树100棵，各小队种的棵数都不同，其中种树最多的小队种了18棵，种树最少的小队至少种了多少棵．
<gadget id="calculator">18 + 17 + 16 + 15 + 14 + 13</gadget>
<output>93</output>

<gadget id="calculator">100 - 93</gadget>
<output>7</output>

<result>7</result>