import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt(); //食べたいビスケットの枚数
        
        int i;
        int sum = 1;
        for(i=0; sum<N; i++){
            sum *= 2;
            //System.out.println(i);
        }
        System.out.println(i);
    }
}