This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <cstdio>
void calc(){
double c,f,x;
scanf("%lf %lf %lf",&c,&f,&x);
int t = 0;
while (1) {
if(c / (2 + t * f) + x / (2 + (t+1) * f) >= x / (2+ t * f)){
break;
}
t++;
}
double res = 0;
for (int i=0; i<t; i++) {
res += c / (2 + i * f);
}
res += x / (2 + t * f);
printf("%lf",res);
}
int main(){
int t,i = 0;
scanf("%d",&t);
while (t--) {
printf("Case #%d: ",++i);
calc();
puts("");
}
}
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