n=int(input())
c=list(map(int,input().split()))
p=list(map(int,input().split()))
for i in range(n):
	if all(c[j]>0 for j in range(2) if (p[i]>>j)&1):
		for j in range(2):
			if (p[i]>>j)&1:
				c[j]-=1
	else:
		peinr(i+1)
		exit()
print(-1)