#include <bits/stdc++.h>
using namespace std;
ifstream fin("evaluare.in");
ofstream fout("evaluare.out");
string op;
int stiva[100005];
const int inmultire = 1e9+1, parant=1e9+2, scad=1e9+3, impart=1e9+5;
int main()
{
    int top=0;
    getline(fin, op);
    for(int i=0; i < op.size(); i++)
    {
        if(isdigit(op[i]))
        {
            int nr=0;
            while(i < op.size() && isdigit(op[i]))
            {
                nr=nr*10+op[i]-'0';
                i++;
            }
            i--;
            if(top==0)
                stiva[++top]=nr;
            else if(stiva[top]==inmultire)
                stiva[--top]*=nr;
            else if(stiva[top]==impart)
                stiva[--top]/=nr;
            else if(stiva[top]==scad)
                stiva[top]=-nr;
            else
                stiva[++top]=nr;
        }
        else if(op[i]=='*')
            stiva[++top]=inmultire;
        else if(op[i]=='-')
            stiva[++top]=scad;
        else if(op[i]=='+')
            continue;
        else if(op[i]=='(')
            stiva[++top]=parant;
        else if(op[i]=='/')
            stiva[++top]=impart;
        else
        {
            int nr=0;
            while(stiva[top]!=parant)
                nr+=stiva[top--];
            top--;
            if(top==0)
                stiva[++top]=nr;
            else if(stiva[top]==inmultire)
                stiva[--top]*=nr;
            else if(stiva[top]==impart)
                stiva[--top]/=nr;
            else if(stiva[top]==scad)
                stiva[top]=-nr;
            else
                stiva[++top]=nr;
        }
    }
    int rez=0;
    for(int i=1; i <= top; i++)
    {
        rez+=stiva[i];
    }
    fout << rez;
    return 0;
}