import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
######################################################################


inf = float('inf')
    
H = W = 5
n = ni()
p = [na() for _ in range(n)]
p = [(x+1, y+1) for x, y in p]
m = ni()
q = [na() for _ in range(m)]
q = [(x+1, y+1) for x, y in q]

ans = inf

for _ in range(4):
    p = [(H - 1 - y, x) for x, y in p]
    q = [(H - 1 - y, x) for x, y in q]

    A = [[-inf]*(W+1) for _ in range(H+1)]

    for x, y in p:
        A[x][y] = x + y
    
    for i in range(H):
        for j in range(W):
            A[i+1][j+1] = max(A[i+1][j+1], A[i][j+1], A[i+1][j])

    # for i in range(H):
    #     print(*A[i])
    # print()

    for x, y in q:
        ans = min(ans, x + y - A[x][y])
    

print(ans)