#include <stdio.h>
#include <math.h>

int main(void)
{
	unsigned long num;	
	fscanf(stderr, "%lu", &num);

	unsigned long cnt = 0;
	num = (long)pow(2, num) - 1;
	while ( num != 0 ) {
		if ( num & 1 ) { cnt++; }
		num >>= 1;  
	}

	fprintf(stderr, "%lu\n", cnt);
	return 0;
}