#include <bits/stdc++.h>
using namespace std;
ifstream in("reteta.in");
ofstream out("reteta.out");
char s[5001];
int cnt;
int verifica(char a[], int q)
{
    while(s[q]==' ')
    {
        q++;
    }
    if(isdigit(s[q]))
    {
       int z=s[q]-'0';
            q++;
        while(isdigit(s[q]))
        {
          z*=10;
          z= z + (s[q]-'0');
        q++;
        }
        return z;
    }
        return 0;
}

char incrediente[256][256];
int su=0;
int main()
{
        in.getline(s,256);
for(int i=0;i<strlen(s);i++)
{
if(s[i]==')')
{
su+=verifica(s, i+1);
}

}

out<<su;
    return 0;
}