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import java.util.*;
 
public class Main {
 
 public static void main(String[] args) {
  Scanner scn = new Scanner(System.in);
  int n = scn.nextInt();
  for (int i = 0; i < n; i++) {
   int a = scn.nextInt(), b = scn.nextInt(), tot = 0;
   if (a % 2 == 0)
    a += 1;
   for (int j = a; j <= b; j += 2) {
    tot += j;
   }
   System.out.printf("Case %d: %d\n", i + 1, tot);
  }
 }
 
 /* 
    題目：Q10783: Odd Sum
    作者：1010
    時間：西元 2016 年 7 月 */
}