#include <iostream>
using namespace std;
int main() {
int day[3];
for(int i = 0; i < 3; i++){
std::cin >> day[i];
}
int ans;
int loop = 1;
int today;
int gap;
int temp;
while(day[0] != 0){
ans = 0;
today = 0;
gap = day[1] - day[0];
temp = 0;
while(today != day[2]){
today++;
ans++;
temp++;
if(today == day[2]) break;
if(temp % day[0] == 0){
today += gap;
temp = 0;
}
}
std::cout << "Case " << loop << ": " << ans << std::endl;
for(int i = 0; i < 3; i++){
std::cin >> day[i];
}
loop++;
}
// std::cout << day[0];
return 0;
}
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