import java.util.Scanner;


public class Main_yukicoder47 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        int ret = 0;
        boolean flag = false;
        while (n / 2 != 0) {
        	if (n % 2 != 0) {
        		flag = true;;
        	}
        	ret++;
        	
        	n /= 2;
        }

        System.out.println(ret + (flag ? 1 : 0));
        
        sc.close();
    }
}