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

int main()
{
    char name[1000];
    long long ans = 0;
    struct stat st;
    char* nl;
    while (fgets(name, sizeof(name), stdin)) {
        nl = memchr(name, '\n', sizeof(name));
        if (nl) {
            *nl = '\0';
        }
        if (-1 != lstat(name, &st) && S_ISREG(st.st_mode)) {
            ans += st.st_size;
        }
    }
    printf("%lld", ans);
}