import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		scan.close();
		int t = 1;
		int cnt = 0;
		if(N == 1) {
			System.out.println(0);
			System.exit(0);
		}
		while(t < N) {
			t *= 2;
			cnt++;
		}
		int a = t - N;
		int ans = a + cnt;
		System.out.println(ans);
	}
}