import numpy as np

N=int(input())
a=[N]
goal=N
flag=0
flag_1=0

while(a[len(a)-1]!=1):
    for i in range(1,N):
        step=np.sum(list(map(int,list(format(i, 'b')))))
        if(step+i==goal):
            flag_1=0
            a.append(i)
            goal=i
            break
    else:
        flag_1=1
        goal=a[len(a)-2]
        for i in range(1,N):
            step=np.sum(list(map(int,list(format(i, 'b')))))
            if(i-step==goal):
                a.pop()
                flag_1=0
                a.append(i)
                goal=i
                break
        else:
            flag=1
            break

if(flag==1):
    print(-1)
else:
    print(len(a))