//uva10783 #include <iostream> using namespace std; int main() { int t, ti = 0; cin >> t; int arr[101] = {}; for(int i = 1; i < 101; ++i) { if(i % 2 == 1) arr[i] = i; arr[i] += arr[i-1]; } while(ti++ < t) { int a, b; cin >> a >> b; if(a == 0) a = 1; cout << "Case " << ti << ": " << arr[b] - arr[a-1] << endl; } return 0; }