import numpy as np
import sys

N = int(input())
A = np.array(input().split(), dtype=np.int64)
B = np.array(input().split(), dtype=np.int64)

C = B - A
m = abs(C.min())

count = 0
while count <= m:
    S = np.unique(C)
    if len(S) == 2 and S.sum() == 0:
        count += abs(S[0])
        print(count)
        sys.exit()

    D = np.full(N, abs(C.min() + C.max()))
    D[C.argmax()] *= -1
    C = C + D
    count += abs(D[0])

print(-1)