def main():
    n = int(input())
    mp = [len([d for d in bin(i)[2:] if d == '1']) for i in range(1, n+1)]
    targets = [n-1]
    count = 1
    while len(targets) != 0 and 0 not in targets:
        tmp = []
        for target in targets:
            tmp += movables(mp, target)
        targets = tmp
        count += 1
    if len(targets) == 0:
        print(-1)
    else:
        print(count)


def movables(mp, target):
    result = []
    for i, p in enumerate(mp):
        if ((i + p == target) or (i - p == target)) and i != target:
            mp[i] = 0
            result.append(i)
    return result


if __name__ == "__main__":
    main()