#include <stdio.h>
#include <stdlib.h>

int sucet(FILE *f)
{
    char c;
    int hod = 0;
    int p = 0;

    while((c = fgetc(f)) != EOF){
            if(c >= '0' && c <= '9'){
                hod = c - '0';
                p += hod;
            }
    }
    return p;
}

int main()
{
    FILE *fr;
    char nazov[30];
    int cis = 1, pocet = 0, hod = 0;
    char c;

    while(1)
    {
        sprintf(nazov, "text%d.txt", cis);
        if((fr = fopen(nazov, "r")) == NULL){
            break;
        }
        pocet = sucet(fr);
        hod += pocet;
        cis++;
        fclose(fr);
    }
    printf("%d\n", hod);
    return 0;
}