#include<stdio.h>
int N;
//行ったことがあったら1
int dp[10000];
int getbit(int x);
main(){
    scanf("%d",&N);
    int step = 1;
    int point = 1;
    while(point != N){
//        printf("%d ",point);//
        //ループ確定
        if(dp[point-1]){
            step = -1;
            break;
        }

        if(point + getbit(point) <= N){
        //前にすすめる場合
            step++;
            dp[point-1] = 1;
            point += getbit(point);
        }else{
        //後ろに進む
            step++;
            dp[point-1] = 1;
            point -= getbit(point);
        }
    }
    printf("%d",step);
    return 0;
}

int getbit(int x){
     return __builtin_popcountl(x);
}