//10783
#include<stdio.h>
int main()
{
int j,i,sum,t,a,b;
while(scanf("%d",&t)==1)
{
for(i=1;i<=t;i++){
scanf("%d%d",&a,&b);
if(b<a)
{
int temp=a;
a=b;
b=temp;
}
sum=0;
for(j=a;j<=b;j++)
{
if((j%2)==1)
sum+=j;
}
printf("Case %d: %d\n",i,sum);
}
}
return 0;
}