Do I owe anything if I doubt the number of pebbles I threw at Jamrat al-Aqaba?

Scholars have differed concerning the ruling on someone who misses throwing a single pebble (during the ritual stoning). Some obligated a compensatory sacrifice (dam) upon him, while others obligated a mudd of food. Still others obligated half a saa' of wheat for each forgotten pebble, while some did not obligate anything. The preponderant opinion is that of the Shafi'i school, and according to it, you are required to give a mudd of food as charity in the Sacred Precinct (Haram (definition)), because doubt during an act of worship is built upon certainty, which is the lesser amount.