#include <iostream>
#include <algorithm>

using namespace std;

int main()
{
  int id = 1;
  int L, P, V;

  while (cin >> L >> P >> V && (L || P || V)) {
    cout << "Case " << id++ << ": ";
    int ans = V / P * L + min(V % P, L);
    cout << ans << endl;
  }


  return 0;
}