import math
N = int(input())
current = [0] * (N + 1)
current[0] = 1
bit =  [0] * (N + 1)
bit[0] = 1
P = 0
if N == 1:
    print(1)
else:
    for i in range(1, N + 1):
        forward = 0
        bit[i] = current[i - 1]
        while bit[i] >= 1:
            if bit[i] % 2 == 1:
                forward += 1
                bit[i] = math.floor(bit[i]/2)
            else:
                bit[i] = int(bit[i]/2)
            #print(forward)   
        current[i] = current[i - 1] + forward
        if current[i] < N:
            current[i] = current[i]
        elif current[i] > N:
            current[i] = current[i-1] - forward
            for j in range(i):
                pen = current[j] - current[i]
                if pen == 0:
                    P += 1
            
    
        if current[i] == N:
            print(i + 1)
            break
        elif (current[i] > N) or (current[i] < 1):
            print(-1)
            break
        if P > 0:
            print(-1)
            break