#include<iostream>
#include<iomanip>
#include<cstring>
#include<cmath>
using namespace std;
int main(){
long long int a,b,c,d;
cin>>a;
for(int x=1;x<=a;x++){
cin>>b>>c;
if(b%2==0){
b++;
}else if(c%2==0){
c--;
}
d=0;
for(int y=b;y<=c;y=y+2){
d=d+y;
}
cout<<"Case "<<x<<": "<<d<<endl;
}
system("pause");
return 0;
}
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