每组5人,多一人,那就是6,11,16,21,26,31,36,41,46,51,56,61,66,71,76,81,86,91,96,101,106,111,116
每组6人,多2人,那就是8,14,20,26,32,38,44,50,56,62,68,74,80,86,92,98,104,110,116
每组8人,多4人,那就是12,20,28,36,44,52,60,68,76,84,92,100,108,116
所以最少116人