Danny Wants To Know

As we know, Danny has a huge army and each time she wins a battle the size of her army is increased. Missandei, her advisor and Handmaiden, keeps the log of each battle and the amount and strength of soldiers won in a battle. Now, Danny has some questions for Missandei in which she asks the strength of the army gained during some battles. She will ask the query of the form $L, R$ and Missandei h