A.cpp

int f(int a, int b) {
  return a * (100+b) / 100;
}
 
int main() {
  int x, y, s;
  while (cin >> x >> y >> s, x) {
    int res = -1;
    REP(i,1024) REP(j,1024) {
      if (i == 0 || j == 0) continue;
      if (f(i,x) + f(j,x) == s) {
        res = max(res, f(i,y) + f(j,y));
      }
    }
    cout << res << endl;
  }
  return 0;
}