import java.util.*;
public class Main
{
static Scanner in = new Scanner (System.in);
public static void main (String[]args)
{
int even;
do
{
System.out.println ("enter an even number except 2 : ");
even = in.nextInt ();
}
while (even % 2 != 0 || even == 2);
int half = even / 2;
int half2 = half;
int j = 2;
int i = 2;
for (i = 2; i < half; i++)
{
if (half % i == 0)
{
half++;
half2--;
i = 2;
}
if (i == (half - 1)){
for (j = 2; j < half2; j++)
if (half2 % j == 0)
{
half++;
half2--;
j = 2;
}
}
if (j == (half2-1))
break;
}
System.out.println ("even = " + half + " + " + half2);
}
}