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

ifstream fin("evaluare.in");
ofstream fout("evaluare.out");

char s[100005];
int lg;

stack <int> val;
stack <char> op;

void read()
{
    fin>>s;
    lg=strlen(s);

    fin.close();
}

int findnr(int &poz)
{
    int nou=0;

    while(isdigit(s[poz])==1)
    {
        nou=nou*10+s[poz]-'0';
        poz++;
    }
    poz--;
    return nou;
}

int Operator(char c)
{
    if(strchr("+-*/",c)) return 1;
    return 0;
}

int Prioritate(char c)
{
    if(c=='(') return 0;
    if(c=='+' || c=='-') return 1;
    if(c=='*' || c=='/') return 2;
}

void solve()
{
    int i;
    int nr,a,b,operatie,r,pr;
    for(i=0;i<lg;++i)
    {
        if(isdigit(s[i]))
        {
         nr=findnr(i);
         val.push(nr);
        }

        if(s[i]=='(') op.push(s[i]);

        if(s[i]==')')
        {
            while(op.top()!='(')
                {
                 b=val.top(); val.pop();
                 a=val.top(); val.pop();
                 operatie=op.top(); op.pop();

                 if(operatie=='+') r=a+b;
                 if(operatie=='*') r=a*b;
                 if(operatie=='/') r=a/b;
                 if(operatie=='-') r=a-b;

                 val.push(r);
                }
              op.pop();
        }

        if(Operator(s[i])==1)
        {
            pr=Prioritate(s[i]);

            while(op.size()>0 && Prioritate(op.top())>=pr)
            {
                 b=val.top(); val.pop();
                 a=val.top(); val.pop();
                 operatie=op.top(); op.pop();

                 if(operatie=='+') r=a+b;
                 if(operatie=='*') r=a*b;
                 if(operatie=='/') r=a/b;
                 if(operatie=='-') r=a-b;

                 val.push(r);
            }
         op.push(s[i]);
        }
    }
     while(op.size()>0)
     {
          b=val.top(); val.pop();
          a=val.top(); val.pop();
          operatie=op.top(); op.pop();

          if(operatie=='+') r=a+b;
          if(operatie=='*') r=a*b;
          if(operatie=='/') r=a/b;
          if(operatie=='-') r=a-b;

          val.push(r);
     }

    fout<<val.top();
}


int main()
{
    read();
    solve();
    return 0;
}