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

enum
{
    SL_SIZE = 2
};

int
main(int argc, char *argv[])
{
    DIR *d = opendir(argv[1]);
    if (d == NULL) {
        return -1;
    }
    unsigned long long mem = 0;
    struct dirent *cur = readdir(d);
    while (cur != NULL) {
        if (strcmp(cur->d_name, ".") && strcmp(cur->d_name, "..")) {
            char name[PATH_MAX];
            char sl[SL_SIZE] = "/\0";
            if (snprintf(name, PATH_MAX, "%s%s%s", argv[1], sl, cur->d_name) !=
                strlen(argv[1]) + strlen(sl) + strlen(cur->d_name)) {
                return -1;
            }
            struct stat cur1;
            if (stat(name, &cur1) == 0 && cur1.st_uid == getuid() && S_ISREG(cur1.st_mode) &&
                cur->d_name[0] >= 'A' && cur->d_name[0] <= 'Z') {
                mem += cur1.st_size;
            }
        }
        cur = readdir(d);
    }
    printf("%llu\n", mem);
    closedir(d);
    return 0;
}