#include <iostream>

using namespace std;

int main()

{

int n;

cin >> n;

for (int i = 0; i < n; i++)

{

int a, b, count = 0;

cin >> a;

cin >> b;

for (int j = a; j <= b; j++)

{

if (j % 2 != 0)

{

count += j;

}

}

cout << "Case " << i + 1 << ": " << count << endl;

}