Shop Game (Easy)

**This problem has the same setup as the hard version. The difference is here you only need the value of the whole string, while in the hard version you need the sum over all substrings.** You are the owner of a shop with $N$ different unique items to sell, numbered $1, 2, \ldots, N$. The items have been numbered such that item $i$ is always larger (in size) than item $i - 1$. The cost of the $i$