#include <stdio.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <limits.h>
#include <string.h>

int
main(int argc, char *argv[])
{
    DIR *main_dir = opendir(argv[1]);
    if (main_dir == NULL) {
        return 1;
    }
    unsigned long long sum = 0;
    struct dirent *curr_dir;
    while ((curr_dir = readdir(main_dir)) != NULL) {
        _Bool is_eq1 = strcmp(curr_dir->d_name, ".");
        _Bool is_eq2 = strcmp(curr_dir->d_name, "..");
        _Bool is_symb = 'A' <= curr_dir->d_name[0] && curr_dir->d_name[0] <= 'Z';
        if (is_eq1 && is_eq2 && is_symb) {
            char folder[PATH_MAX];
            snprintf(folder, PATH_MAX, "%s%s", argv[1], curr_dir->d_name);
            struct stat f;
            _Bool is_exists = stat(folder, &f) != -1;
            _Bool is_reg = S_ISREG(f.st_mode);
            _Bool is_uid_equ = f.st_uid == getuid();
            sum = is_exists && is_reg && is_uid_equ ? sum + f.st_size : sum;
        }
    }
    printf("%llu", sum);
    if (closedir(main_dir) == -1) {
        return -1;
    }
    return 0;
}