function main(input) {
  var N = input[0].split(" ")[0]-0;
  var list = input[1].split(" ").map(v=>v-0);
  var ans = 0;
  list.forEach(v=>{
    var cnt = 0;
    while(v%2==0){
      v/=2;
      cnt++;
    };
    ans += cnt;
  })
  console.log(ans);
}
main(require('fs').readFileSync('/dev/stdin', 'utf8').trim().split("\n"))
