Chef Bakes Cake 2

Chef is an expert baker. To make a cake, he needs $N$ different ingredients numbered $1, 2, \ldots, N$. He needs $A_i$ amount of the ingredient numbered $i$, and he currently has $B_i$ amount of that ingredient already. Each ingredient costs him $1$ coin to buy. Find the total cost of buying the excess ingredients necessary to make $1$ cake. ### Input - The first line of input will contain a sin