#include <fstream>
#include<string.h>
using namespace std;
ifstream fin("evaluare.in");
ofstream fout("evaluare.out");
int prior(char c){if(c=='+'||c=='-')return 1;
                  if(c=='*'||c=='/')return 2;
                  if(c=='('||c==')')return 0;
                  else return -1;
                 }
int main()
{  char s[100002],expr[100002]="(";

   fin.getline(s,100002);
   int i,nr;
   i=strlen(s);
   s[i]=')';
   s[i+1]=0;
   int k=0,l=-1;
   int st[100000],vf=0,stnr[100002];
   char stc[100000];
   stc[0]='(';
   for(i=0;i<strlen(s);i++)
       {nr=0;
        while(prior(s[i])<0&&i<strlen(s))nr=nr*10+s[i++]-'0';

        if(nr){st[++k]=nr;i--;expr[++l]='a';}
           else{if(s[i]=='(')stc[++vf]='(';
                if(s[i]==')'){while(stc[vf]!='(')expr[++l]=stc[vf--];vf--;}
                if(prior(s[i])>0){while(prior(stc[vf])>prior(s[i]))expr[++l]=stc[vf--];
                                 stc[++vf]=s[i];}
               }
       }
    expr[++l]=0;
    vf=0;
    nr=0;
    for(i=0;i<l;i++)
        if(expr[i]=='a'){++nr;stnr[++vf]=st[nr];}
            else{if(expr[i]=='+'){stnr[vf-1]=stnr[vf-1]+stnr[vf];vf--;}
                 if(expr[i]=='-'){stnr[vf-1]=stnr[vf-1]-stnr[vf];vf--;}
                 if(expr[i]=='*'){stnr[vf-1]=stnr[vf-1]*stnr[vf];vf--;}
                 if(expr[i]=='/'){stnr[vf-1]=stnr[vf-1]/stnr[vf];vf--;}
                }
    fout<<stnr[1];


    return 0;
}