#include<iostream>
using ll = long long;
using namespace std;
string str;
int i=0;
int func();
int calc(){
    int num = func();
    while(1){
        if(str[i]=='+'){
            i++;
            num+=func();
        }
        else if(str[i]=='-'){
            i++;
            num-=func();
        }
        else    return num; 
    }
}

int func(){
    if('0'<=str[i]&&str[i]<='9'){
        int res=str[i]-'0';
        i++;
        return res;
    }
    if(str[i]=='('){
        i++;
        int res=calc();
        i++;
        return res;
    }
}

int main(){
    cin >> str;
    cout << calc() << endl;
    return 0;
}