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#include<bits/stdc++.h>
using namespace std;
int main()
{
    int x1,y1,w1,h1;
    cin>>x1>>y1>>w1>>h1;
    int x2,y2,w2,h2;
    cin>>x2>>y2>>w2>>h2;
    int x3,y3,w3,h3;
    cin>>x3>>y3>>w3>>h3;
    int w=min(x1+w1,min(x2+w2,x3+w3))-max(x1,max(x2,x3));
    int h=min(y1,min(y2,y3))-max(y1-h1,max(y2-h2,y3-h3));
    cout<<max(w,0)*max(h,0);
    return 0;
}