typedef struct _iobuf
{
	char*	_ptr;
	int	_cnt;
	char*	_base;
	int	_flag;
	int	_file;
	int	_charbuf;
	int	_bufsiz;
	char*	_tmpfname;
} FILE;

extern "C"
{
    FILE* fopen (const char*, const char*);
    int fclose( FILE *fp );
    int fscanf (FILE*, const char*, ...);
    int fprintf (FILE*, const char*, ...);
}

int main()
{
    FILE *in = fopen ("adunare.in", "r"),
         *out = fopen ("adunare.out", "w");
    int a, b;

    fscanf (in, "%d %d", &a, &b);
    fprintf(out, "%d", a+b);

    fclose (in);
    fclose (out);
}