using System;using System.Collections.Generic;namespace ConsoleApplication7{
class Program
{
static void Main(string[] args)
{
HashSet hashSet = new HashSet();
Random rd = new Random();
while (hashSet.Count < 4)
{
int n = rd.Next();
if (!hashSet.Contains(n))
{
hashSet.Add(n);
}
}
foreach( int number in hashSet )
{
Console.WriteLine(number);
}
}
}}
