private static List<Activity> ReadActivities()
{
int numberOfActivities = int.Parse(Console.ReadLine());
var activities = new List<Activity>();
for (int i = 0; i < numberOfActivities; i++)
{
int[] fromTo = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
int from = fromTo[0];
int to = fromTo[1];
activities.Add(new Activity(from, to));
}
return activities;
}