Write some Ints to a File in C#

WriteSomeIntsToAFile.cs

using System;
using System.IO;

class Program {
    
    static int Main() {

	int X = 1, Y = 20, Z = 455;
	
	var writer = new StreamWriter("save.txt");
	writer.WriteLine(X);
	writer.WriteLine(Y);
	writer.WriteLine(Z);
	writer.Close();
	
	var reader = new StreamReader("save.txt");
	Console.WriteLine("Reading save.txt:");
	Console.WriteLine(int.Parse(reader.ReadLine()));
	Console.WriteLine(int.Parse(reader.ReadLine()));
	Console.WriteLine(int.Parse(reader.ReadLine()));

	return 0;
    }
}