int main() {
	int n, snt = 1;
	printf("nhap vao 1 so nguyen duong: ");
	scanf_s("%d", &n);
	if (n <= 2) {
	}
	else{
	}for (int i = 2; i <= n / 2; i++)
		if (n % i == 0)
		{
		snt = 0; break;
		}

	if (snt == 1)
		printf("%d la so nguyen to", n);
	else
	printf("%d khong la so nguyen to ", n);

	return 0;

		
}