import java.util.Scanner;

public class Main {
    public static int N;
    public static int[] Child;
    public static int count = 0;  //最终输出结果
    
    public void getResult() {
        while(true) {
            boolean judge = true;
            for(int i = 1;i < N;i++) {
                if(Child[0] != Child[i]) {
                    judge = false;
                    break;
                }
            }
            if(judge)
                break;
            int[] half = new int[N];
            for(int i = 0;i < N;i++) {
                if(i == N - 1)
                    half[0] = Child[i] / 2;
                else
                    half[i + 1] = Child[i] / 2;
            }
            for(int i = 0;i < N;i++) {
                Child[i] = Child[i] / 2 + half[i];
                if(Child[i] % 2 == 1) {
                    count++;
                    Child[i]++;
                }
            }
        }
        System.out.println(count);
    }
    
    public static void main(String[] args) {
        Main test = new Main();
        Scanner in = new Scanner(System.in);
        N = in.nextInt();
        Child = new int[N];
        for(int i = 0;i < N;i++)
            Child[i] = in.nextInt();
        test.getResult();
    }
}