import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int a=sc.nextInt();
int sum=0;
int count=0;
for (int i = 2; i <= a; i*=2) {
sum++;
if(a%i==0){
count=sum;
}
}
System.out.println(count);
}

}