ABC100C

#include <iostream>
using namespace std;
int main(int argc, char const *argv[]) {
  int n;
  cin>>n;
  int ans=0;
  for(int i=0;i<n;i++){
    int a;
    cin>>a;
    while(a%2==0) a/=2,ans++;
  }
  cout<<ans<<endl;
  return 0;
}