using System;

​

​

public class City

    {

        public int number_city { get; set; }

        public int x { get; set; }

        public int y { get; set; }

        public Slot[,] slots { get; set; }

    }

​

    public class Slot

    {

        public City city { get; set; }

​

        public int x { get; set; }

        public int y { get; set; }

    }

​

​

public class Program {

     static double GetDistance(int c0, int l0, int c1, int l1)

        {

            int dX = l1 - l0;

            int dY = c1 - c0;

            return Math.Sqrt(dX * dX + dY * dY);

        }

    public void Main() {

            City city1 = new City();

            city1.number_city = 1;

            city1.x = 5 * 7;

            city1.y = 5 * 7;

            City city2 = new City();

            city2.number_city = 2;

            city2.x = 2 * 7;

            city2.y = 2 * 7;

​

            Slot slot1 = new Slot();

            slot1.x = 3 + city1.x;

            slot1.y = 3 + city1.y;

​

​

​

            Slot slot2 = new Slot();

            slot2.x = 3 + city2.x;

            slot2.y = 3 + city2.y;

        var x = GetDistance(slot1.x, slot1.y, slot2.x, slot2.y);

        Console.WriteLine(x.ToString());

    }

}