#include <stdio.h>
#include <stdlib.h>

int bit(int a);

int main(void) {
    int N;
    int s = 1; // step
    int c = 0; // check

    scanf("%d", &N);

    int math[10001] = {0};
    math[1] = 1;
    for (; ; s++) {
        c = 0;
        for (int i = 1; i <= N; i++) {
            if (math[i] == s) {
                int d = bit(i); // distance
                if (i+d == N) {
                    printf("%d\n", s+1);
                    exit(EXIT_SUCCESS);
                }
                if (i+d < N && !math[i+d]) {
                    math[i+d] = s+1;
                    c = 1;
                }
                if (0 < i-d && !math[i-d]) {
                    math[i-d] = s+1;
                    c = 1;
                }
            }  
        }
        if (!c) {
            printf("-1\n");
            exit(EXIT_SUCCESS);
        }
    }
    return EXIT_SUCCESS;
}

int bit(int a) {
    int t = 0;
    for (; a;) {
        if (a % 2) {t++;};
        a /= 2;
    }
    return t;
}