#include<fcntl.h>
#include<sys/types.h>
#include<unistd.h>
#include<sys/stat.h>
#define LEN 512
int main(int argc, char** argv) {
	int f1, f2, f3, n = 0;
	char buf[520], ch = '\n';
	f1 = open(argv[1], O_RDWR);
	f2 = open(argv[2], O_RDWR);
	f3 = open(argv[3], O_CREAT | O_RDWR);
	while ((n = read(f1, buf, LEN)) > 0)
		write(f3, buf, n);
	write(f3, &ch, 1);
	while ((n = read(f2, buf, LEN)) > 0)
		write(f3, buf, n);
	close(f1);
	close(f2);
	close(f3);
	return 0;
}