N = int(input())
ans = N+1
q = [1]
c = 1
r = [1]*N
while c < ans:
    l = []
    for i in q:
        ri = i-1
        if i == N:
            ans = c
        elif r[ri]:
            r[ri] = 0
            b = bin(i).count('1')
            n, m = i+b, i-b
            if n <= N : l += [n]
            if m > 0 : l += [m]
    q = l
    c += 1
print(ans if ans < N+1 else -1)