import java.util.*;

class No354_Yukicoder {

	public static void main(String[] args) {
	
		Scanner sc = new Scanner(System.in);
		long p = sc.nextLong();
		long mel = (2<<p)-1;
		int ans = 1;
		while(mel!=1) {
		
			if(mel%2==1) ans++;
			mel/=2;
			
		}
		
		System.out.println(ans);
	
	}
	
}