package me.yukicoder;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class No0354 {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int n = Integer.parseInt(br.readLine());
		long num = (long) Math.pow(2.0, n) - 1;
		int cnt = 0;

		for (char c : Long.toBinaryString(num).toCharArray()) {
			cnt = c == '1' ? cnt + 1 : cnt;
		}
		System.out.println(cnt);
	}
}