#include <fstream>
using namespace std;
ifstream fin("evaluareexpresie.in");
ofstream fout("evaluareexpresie.out");
char s[100005], st1[50001];
int i,st2[50001],vf1,vf2, pr[256];
int calcul(int a, int b, char op){
   switch(op){
   case  '+':return a+b;
   case  '-': return a-b;
    case '*': return a*b;
     case '/':return a/b;
   }
}
int main()
{
    fin.getline(s,100001);
    pr['+']=pr['-']=1;
    pr['*']=pr['/']=2;
    for(i=0;s[i]!=0;i++)
        if(s[i]=='(')
             st1[++vf1]=s[i];
        else
           if(s[i]==')'){
                 while(st1[vf1]!='('){
                      int  rez=calcul(st2[vf2-1],st2[vf2],st1[vf1]);
                        vf1--;/// elimin operatorul
                        vf2--;
                        st2[vf2]=rez;
                       }
                    vf1--; ///elimin   (
            }
          else
              if(s[i]>='0'&&s[i]<='9'){
                    int nr=0;
                    while(s[i]>='0'&&s[i]<='9'){
                        nr=nr*10+s[i]-'0';
                        i++;
                    }
                    i--;
                     st2[++vf2]=nr;
                    }
                else  /// operator
                {
                    while(vf1>0&&pr[st1[vf1]]>=pr[s[i]]){
                       int  rez=calcul(st2[vf2-1],st2[vf2],st1[vf1]);
                         vf1--;/// elimin operatorul
                         vf2--;
                        st2[vf2]=rez;
                    }
                    st1[++vf1]=s[i];
                }
    while(vf1>0){
       int  rez=calcul(st2[vf2-1],st2[vf2],st1[vf1]);
          vf1--;/// elimin operatorul
          vf2--;
          st2[vf2]=rez;/// adaug rezultatul
    }
    fout<<st2[vf2];
    return 0;
}