#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>

enum
{
    BSIZE = 16
};

int
main(int argc, char *argv[])
{
    char s[BSIZE];
    int sgn = 1;
    unsigned long long ans = 0;
    int inpt;

    while ((inpt = read(STDIN_FILENO, s, sizeof(s)))) {
        if (inpt == -1) {
            exit(1);
        }
        unsigned long long curr = 0;
        int it = 0;
        while (it < BSIZE) {
            if ('0' <= s[it] && s[it] <= '9') {
                curr *= 10;
                curr += s[it] - '0';
            }
            if (s[it] == '-') {
                sgn = -1;
            }
            if (isspace(s[it])) {
                curr *= sgn;
                sgn = 1;
                ans += curr;
                curr = 0;
            }
            s[it] = 0;
            ++it;
        }
    }

    printf("%lld\n", (long long) ans);
    return 0;
}