#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
    string s;
    cin>>s;
    int n=s.size();
    int i=0;
    int sign=1;
    if (s[i]=='+'||s[i]=='-') {
        if (s[i]=='-') sign=-1;
        i++;
    }
    int fst=0;
    while (isdigit(s[i])) {
        fst=10*fst+s[i]-'0';
        i++;
    }
    fst*=sign;
    sign=1;
    if (s[i]=='+'||s[i]=='-') {
        if (s[i]=='+') sign=-1;
        i++;
    }
    if (s[i]=='+'||s[i]=='-') {
        if (s[i]=='-') sign*=-1;
        i++;
    }
    int snd=0;
    while (i<n&&isdigit(s[i])) {
        snd=10*snd+s[i]-'0';
        i++;
    }
    snd*=sign;
    cout<<fst+snd<<endl;
    return 0;
}