using System;

public class Program

{

    public static bool ePrimo(int num){

        int div = 0;

        for (int i = 1; i <= num; i++)

        {

            if (num % i == 0)

            {

                div++;

            }   

        }

        return div == 2;

    }

    public static void Main()

    {

        Random r = new Random();

​

        int p = r.Next(1, 100);

​

        while (!ePrimo(p))

        {

            p = r.Next(1,100);

        }

        Console.WriteLine(p);

    }

}