import java.util.Scanner;

class Test {
	public static void main(String[] args) throws Exception {
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();

		int num = 1;
		int counts = 0;

		while(true) {
			num *= 2;
			if(num > n) {
				break;
			}
			counts++;
		}

		int w = n - (num / 2);
		if(w != 0) {
			counts++;
		}

		System.out.println(counts);
	}
}