#include <a_samp>

main()
{
	for(new i = 0; i <= 20; i++)
	{
	    if (IsPrime(i)) {
	        printf("%d is a PRIME number!", i);
	    }
	    else {
	        printf("%d is a NATURAL number!", i);
	    }
	}
}

IsPrime(val)
{
	if (val == 0 || val == 1 || val == 2 || val == 3 || val == 5) {
 		return 1;
 	}
 	
	// If the remainder of the value is 0 when divided by
	// 2, 3, 4 or 5 then it's a "Natural number" therefore
	// it's NOT a "Prime number".
	if (val % 2 == 0 || val % 3 == 0 || val % 5 == 0) {
		return 0;
	}
	
	// Else if it's not a Natural number then it's a Prime number.
	return 1;
}