N = int(input())
a = 1
b = [1]
c = []
g = []
if N == 1:
    print(1)
else:    
    while a:
        c = b
        c = list(set(c))
        f = list(set(b)-set(g))
        print(b)
        print(c)
        print(f)
        print(g)
        for i in range(0,len(f)):
             d = bin(f[i]).count("1")
             p = f[i] + d 
             q = f[i] - d
             if p <= N:
                b.append(p)
             if q > 0:
                b.append(q)
        a += 1
        g = c
        b = list(set(b))
        if N in b:
            print(a)
            break
        if b == c:
            print(-1)
            break