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