using System;



class Program
{
    class Point
    {
        private int[] _point = new int[3];
        public Point(int x, int y, int z)
        {
            X = x;
            Y = y;
            Z = z;
        }
        public double _mass;
        public int X
        {
            get => _point[0];
            set => _point[0] = value;
        }
        public int Y
        {
            get => _point[1];
            set => _point[1] = value;
        }
        public int Z
        {
            get => _point[2];
            set => _point[2] = value;
        }
        public double Mass
        {
            get => _mass;
            set => _mass = value > 0 ? value : 0;
        }
        public bool IsZero()
        {
            if (X == 0 && Y == 0 && Z == 0) return true;
            else return false;
        }
        public double Distance(Point p)
        {
            double _distance = Math.Sqrt((p.X - X) * (p.X - X) + (p.Y - Y) * (p.Y - Y) + (p.Z - Z)* (p.Z - Z));
            return _distance;
        }
    }


    static void Main()
    {
        Point p1 = new Point(0, 0, 0);
        Point p2 = new Point(1, 2, 3);
        p1.Mass = 0.33;
        p2.Mass = -0.33;
        Console.WriteLine("All p1 coordinates are 0? " + p1.IsZero());
        Console.WriteLine("Weight of p2 is " + p2.Mass + ", but at first it was -0.33");
        Console.WriteLine("Distance between p1 and p2 is " + p1.Distance(p2));
        p1.X = 3;
        p1.Y = 4;
        p1.Z = 1;
        Console.WriteLine($"After changing, the coordinates of point p1 is ({p1.X};{p1.Y};{p1.Z})");
        Console.ReadKey();
    }
}