The school distributed prizes to outstanding young pioneers, bought a box of pencils, every 4 ones got 3 more, every 5 got 4 more, and every 6 got 5 more. At least how many pencils are there in this box?
学校给优秀少先队员发奖品，买来了一盒铅笔，每4支一份多3支，每5支一份多4支，每6支一份多5支．这盒铅笔至少有多少支？
<gadget id="calculator">60 - 1</gadget>
<output>59</output>

<result>59</result>