If you walked or ran with no weight, enter 0.
Otherwise, enter the weight (or average weight if you changed it over the course of the ruck) you carried.
Just like in the regular daily scores, your challenge score will be (100 × miles) + (weight × miles).
So if you rucked 10 miles with 30 pounds, your score would be 1300 (100 × 10) + (30 × 10).