#include<stdio.h>
int main(void){
	unsigned int N;
	scanf("%d",&N);
	N--;
	N=N|(N>>1);
	N=N|(N>>2);
	N=N|(N>>4);
	N=N|(N>>8);
	N=N|(N>>16);
	N=(N&0x55555555)+(N>>1&0x55555555);
	N=(N&0x33333333)+(N>>2&0x33333333);
	N=(N&0x0f0f0f0f)+(N>>4&0x0f0f0f0f);
	N=(N&0x00ff00ff)+(N>>8&0x00ff00ff);
	N=(N&0x0000ffff)+(N>>16&0x0000ffff);
	printf("%d\n",N);
	return 0;
}