#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main() {
    struct stat file;
    char buf[5000];
    off_t result = 0;
    while (1) {
        char* st = fgets(buf, sizeof(buf), stdin);
        if (st == NULL) {
            break;
        }
        int str_sz = strlen(buf);
        if (buf[str_sz - 1] == '\n') {
            buf[str_sz - 1] = '\0';
        }
        int status = lstat(buf, &file);
        if (status == 0 && S_ISREG(file.st_mode)) {
            result += file.st_size;
        }
    }
    printf("%ld", result);
    return 0;
}