with open('seqgame.inp') as f:
    n = int(f.readline())
    b = list(map(int,f.readline().split()))
    c = list(map(int,f.read().split()))
b.sort()
c.sort()
i = 0;j = n-1
kq = abs(b[i]+c[j])
while i<n and j>=0:
    if(b[i]+c[j]==0):
        kq = 0
        break
    if(b[i]+c[j]<0):i += 1
    if(i==n):break
    kq = min(kq,abs(b[i]+c[j]))
    if(b[i]+c[j]>0):j -= 1
    if(i<0):break
    kq = min(kq,abs(b[i]+c[j]))
with open('seqgame.out','w') as f:
    f.write(str(kq))