Minimum Numbers of Function Calls to Make Target Array

Given an array of integers target, you need to create the array target from an initial array arr that is initially all 0's. You can perform the following operations any number of times: Increment arr[i] by 1 for all integers i such that 0 <= i < arr.length. Double arr[i] for all integers i such that 0 <= i < arr.length. Return the minimum number of function calls to make target array.