#include <stdlib.h>
#include <stdio.h>

int
main(int argc, char *argv[])
{
	size_t size = 1000000;

	if (argc > 1) {
		if (sscanf(argv[1], "%zu", &size) != 1) {
			printf("Not a number\n");
			return 1;
		}
	}

	printf("size = %zu\n", size);

	if (malloc(size) != NULL) {
		printf("OK!\n");
	} else {
		printf("NULL!\n");
	}

	return 0;
}