using System;

public class Program

{

    public static void Main()

    { 

        int i,j,prime;

        for(i=2;i<=100;i++)

        {

            prime=0;

        for (j=2;j<=i/2;j++)

        {

            if (i%j==0)

            {

                prime=1;

                break;

            }

        }

            if(prime==0)

                Console.WriteLine( ""+i);

    }

}

}