N=int(input())
a=1
d=1
e=[1]
if N==1:
    print(1)
else:
     while d!=N:
            f=e
            for i in range(0,len(e)):
                h=format(e[i],'b')
                j=[int(x) for x in list(str(h))]
                k=sum(j)
                if e[i]+k<=N:
                    e.append(e[i]+k)
                if e[i]-k>=0:
                    e.append(e[i]-k)
            a+=1
            e =list(set(e))
            if e==f:
                break
                print(-1)
            if N in e:
                print(a)
                break