Marathon

Chefland is holding a virtual marathon for the categories $10$ km, $21$ km and $42$ km having prizes $A, B, C$ ($A \lt B \lt C$) respectively to promote physical fitness. In order to claim the prize in a particular category the person must cover the total distance for that category within $D$ days. Also a single person **cannot** apply in multiple categories. Given the maximum distance $d$ km th