import java.util.*;

public class Main {
	public static void main(String[] args)  {
		Scanner scan = new Scanner(System.in);
		int n =Integer.parseInt(scan.next());
		int ans=0, count,a;
		for(int i=0;i<n;++i){
			a=Integer.parseInt(scan.next());
			count=0;
			while(a%2==0){
				count++;
				a/=2;
			}
			ans+=count;
		}
		System.out.print(ans);

	}
}
//end
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz