import java.util.*;

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

		int p = sc.nextInt(), cnt = 0;
		
		p = (int)Math.pow(2, p) - 1;
		
		String bin = Integer.toBinaryString(p);
		
		for(int i = 0; i < bin.length(); i++) {
			int tmp = Integer.parseInt(bin.substring(i, i + 1));
			
			if(tmp == 1) {
				cnt++;
			}
		}
		
		System.out.println(cnt);
	}
}