// Dart - Problem 1: Lemonade Sale (Fresh version)
void main() {
  print("Welcome to the Lemonade Sale!");
  double pricePerGlass = 2.0;
  double c = 25, f = (c * 9/5) + 32;
  print("Today's temperature: ${c}°C = ${f}°F");
  List<int> customersPerHour = [7,9,8,10,6,12,9,8,10,11,7,13];
  int total = 0, freeCups = 0, hourReached = 0;
  for (int h = 0; h < customersPerHour.length; h++) {
    for (int i = 1; i <= customersPerHour[h]; i++) {
      int next = total + 1; if (next % 5 == 0) freeCups++; total++;
      if (total >= 100) { hourReached = h + 1; break; }
    }
    print("Hour ${h+1} -> total: $total (free: $freeCups)");
    if (total >= 100) break; hourReached = h + 1;
  }
  int paid = total - freeCups; double revenue = paid * pricePerGlass;
  if (total > 50) revenue *= 0.90;
  print("Final revenue: \$${revenue.toStringAsFixed(2)} (hours: $hourReached)");
}