✅ 그리디
#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int num = 0;
while(1){
num ++;
int L, P, V, cnt = 0;
cin >> L >> P >> V;
if(L == 0 && P == 0 && V == 0) break;
cnt += V / P * L;
if (V % P < L)
cnt += V % P;
else
cnt += L;
cout << "Case " << num << ": " << cnt << "\n";
}
return 0;
}