#include <stdio.h>

int fnBitCount(int);

int main(void){
    
int N;
int location=1; 
int bit=0;      
int times=1;    

scanf("%d",&N);

while(location != N)
{
	bit = fnBitCount(location);
	if((bit+location) <= N) location += bit;
	else					location -= bit;
	
	if(times >= 10000){
	printf("-1");
	break;
	}
	times++;
}

if(times < 10000)
printf("%d",times-1);

return 0;   
    
}

int fnBitCount(int n)
{
int bit_counter=0;
while(n>=1)
{
	if(n%2==1)bit_counter++;
	n/=2;
}
return bit_counter;
}