m0_66161447:

#include

using namespace std;

typedef long long ll;

int main()

{

ll x1,y1,x2,y2,x3,y3,x4,y4;

cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3 >> x4 >> y4;

ll res = (x1 - x2) * (y1 - y2) + (x3 - x4) * (y3 - y4);

//计算重合面积的长和宽

ll c = min(x2,x4) - max(x1,x3);

ll k = min(y2,y4) - max(y1,y3);

if(c > 0 && k > 0)

res -= c * k;

cout<

return 0;

}