/* put or take a prime */

isprime(x)
{
    int y = 3;
    if ((x & 1) == 0) return 0;
    for (;;) {
	if (y * y > x) return 1;
	if ((x / y) * y == x) return 0;
	y += 2;
    }
}

bigprime(x)
{
    while (!isprime(x)) x--;
    return x;
}

P(x)
{
    int y;
    if (x == 0 || x == 1) return 1;
    y = bigprime(x);
    return (!P(x - y) && !P(x + y));
}

main(ac,av)
char **av;
{
    int x = atoi(av[1]);
    int y;
    while (x > 1) {
	y = bigprime(x);
	if (P(x - y)) {
	    printf("%d:%d\n", x, x-y);
	    x -= y;
	} else {
	    if (P(x+y)) printf("%d:%d\n", x, x+y);
	    else printf("%d:(%d,%d)\n", x, x-y, x+y);
	    x += y;
	}
    }
}