N = int(input())
ans = N+1
q = [1]
r = set([])
for i in range(1, N+1):
    l = []
    for j in q:
        if j == N:
            ans = i
        elif (not j in r):
            r.add(j)
            b = bin(j).count('1')
            n, m = j+b, j-b
            if n <= N : l += [n]
            if m > 0 : l += [m]
    q = l
print(ans if ans < N+1 else -1)