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

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

int priority(char c)
{
    switch(c)
    {
    default:
        return -1;
    case '*':
    case '/':
        return 2;
    case '+':
    case '-':
        return 1;
    }
}

string postfix(string e)
{
    string rez="";
    stack <char> stiva;

    for(int i=0; i<e.size(); i++)
    {
        if(e[i]>='0' && e[i]<='9')
        {
            rez+=e[i];
            if(!(e[i+1]>='0' && e[i+1]<='9')) rez+='|';
        }
        else
        {
            switch(e[i])
            {
            case '(':
                stiva.push(e[i]);
                break;
            case ')':
            {
                while(stiva.top()!='(')
                {
                    rez+=stiva.top();
                    stiva.pop();
                }
                stiva.pop();
                break;
            }
            default:
            {
                if(!stiva.empty())
                while(priority(e[i])<=priority(stiva.top()))
                {
                    rez+=stiva.top();
                    stiva.pop();
                    if(stiva.empty()) break;
                }
                stiva.push(e[i]);
                break;
            }
            }
        }
    }
    while(!stiva.empty())
    {
        rez+=stiva.top();
        stiva.pop();
    }

    return rez;
}

ll ToNum(string s)
{
    ll x=0;

    for(int i=0;i<s.size();i++)
        x=x*10+int(s[i]-48);
    return x;
}

ll calcul(ll a,ll b, char op)
{
    switch(op)
    {
        default: return -1;
        case '+': return a+b;
        case '-': return a-b;
        case '*': return a*b;
        case '/': return a/b;
    }
}
int main()
{
    string s="",e="";
    in>>s;

    e=postfix(s);
    //cout<<e;

    stack <ll> stiva;

    for(int i=0;i<e.size();i++)
    {
        if(e[i]>='0' && e[i]<='9')
        {
            string nr="";
            for(;e[i]!='|';i++)
                nr+=e[i];
            stiva.push(ToNum(nr));
            //cout<<nr<<'\n';
        }
        else
        {
            ll a,b;
            a=stiva.top();
            stiva.pop();
            b=stiva.top();
            stiva.pop();

            stiva.push(calcul(b,a,e[i]));
        }
    }
    out<<stiva.top();
    return 0;
}