#include<iostream> #include<cmath> #include<algorithm> #include<iomanip> #define max(a,b) a>b?a:b #define min(a,b) a<b?a:b using namespace std; int main() { double arr[2][4]; while (cin >> arr[0][0] >> arr[1][0] >> arr[0][1] >> arr[1][1] >> arr[0][2] >> arr[1][2] >> arr[0][3] >> arr[1][3]) { if (max(arr[0][0], arr[0][1]) <= min(arr[0][2], arr[0][3]) || (min(arr[0][0], arr[0][1]) >= max(arr[0][2], arr[0][3])) || max(arr[1][0], arr[1][1]) <= min(arr[1][2], arr[1][3]) || (min(arr[1][0], arr[1][1]) >= max(arr[1][2], arr[1][3]))) cout << "0.00" << endl; else { double x; sort(arr[0], arr[0] + 4); sort(arr[1], arr[1] + 4); x = (arr[0][1] - arr[0][2])*(arr[1][1] - arr[1][2]); cout << setiosflags(ios::fixed) << setprecision(2) << fabs(x) << endl; } } return 0; }