#include<stdio.h>
#include<math.h>
int main()
{
	long a,binary=0,p;
	scanf("%ld\n",&p);
	a=pow(2,p)-1;
	while(a>0){
	    binary += ( a % 2 );
	    a /= 2;
	}
	printf("%ld\n",binary);
	return 0;
}