#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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