def square_size(meteors, t) -> int:
    posX = [m[0] + m[2]*t for m in meteors]
    posY = [m[1] + m[3]*t for m in meteors]
    win_size = (
        (max(posX)-min(posX)) *
        (max(posY)-min(posY))
    )
    return win_size


N = int(input())
meteors = [[int(i) for i in input().split()] for _ in range(N)]