close
#include <iostream>
using namespace std;
int main()
{
int num, x1, y1, x2, y2;
while (cin>>num)
for (int i = 1; i <= num; ++i) {
cin >> y1 >> x1 >> y2 >> x2;
long long n = (x1+y1) * (x1+y1+1LL) / 2LL + y1;
long long m = (x2+y2) * (x2+y2+1LL) / 2LL + y2;
cout << "Case " << i << ": " << (m-n) <<endl;
}
return 0;
}
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