// 絶対TLEする

#include <stdio.h>

int bc(long long int a) {
	int c = 0;
	while(a) {
		c += a % 2;
		a /= 2;
	}
	return c;
}

int main(void) {
	long long int n, p = 1, c = 1;
	scanf("%lld", &n);
	while(p < n) {
		p += bc(p);
		c++;
	}
	printf("%lld\n", (p == n) ? c : -1 );
	return 0;
}