#include <stdio.h>
int main(void){
	int num = 0;
	scanf("%d",&num);
	
	int prime = 0;
	for(int i = 0;i < num;i ++){
		prime *= 2;
	}
	prime -= 1;
	
	int count = 0;
	while(prime > 2){
		if(prime % 2 == 1){
			count++;
		}
		prime /= 2;
	}
	printf("%d",count + 1);
}