#include <stdio.h>
int main()
{
    int t,a,b,i,j=1,sum;
   
    scanf("%d",&t);
   
    while( t-- )
   
    {
        sum = 0;
        scanf("%d %d",&a,&b);
       
        for( i=a ; i<=b ; i++)
       
        {
            if(i%2==1)
           
            sum += i;
           
        }
   
    printf("Case %d: %d\n",j,sum);
    j++;
}
return 0;
}
 
			  
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