import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int s = 1;
        int t = 0;
        for (int i = 0; i < n; i++) {
            s = s * 2;
            t++;
            if (n <= 1) {
                System.out.println(0);
            } else if (s >= n) {
                System.out.println(t);
                break;
            }    
        }
    }
}