static void Main(string[] args) {
int N = int.Parse(Console.ReadLine());
Game game = new Game();
for (int i = 0; i < N; i++) {
string[] inputs = Console.ReadLine().Split(' ');
int J = int.Parse(inputs[0]);//Starting day
int D = int.Parse(inputs[1]);//Reservation length
game.AddReservation(new Reservation(J, D));
}
// Write an action using Console.WriteLine()
// To debug: Console.Error.WriteLine("Debug messages...");
Console.WriteLine(game.Solve());
}