#include <stdbool.h>
#include <stdio.h>

bool is_prime(int n) {
	int divisor;

	if (n <= 1)
		return false;
	for (divisor = 2; divisor * divisor <= n; divisor++)
		if (n % divisor == 0)
			return false;
	return true;
}

int main(void) {
	int n;

	printf("Enter a number: ");
	scanf("%d", &n);
	if (is_prime(n))
		printf("Prime\n");
	else
		printf("Not prime\n");

	return 0;
}