Dora Cake

Chef plans to create $N$ bean jam buns. To make a perfect bean jam bun, bun size should be equal to the amount of jam. He has $N$ buns with $i$-th bun having size $b_i$, and $N$ bottles of jam, $i$-th bottle having amount $d_i$. He can cut a piece from a bun, and throw the extra part away. Similarly, he can use some part of a particular jam bottle and throw the extra away. He cannot use the sam