#include <bits/stdc++.h>
std::ifstream fin("evaluare.in");
std::ofstream fout("evaluare.out");
std::stack<int>s;
std::stack<char>operatii;
std::pair<int,int>numar(std::string ec,int i)
{
    int ans=0;
    while(i<ec.size()&&ec[i]>='0'&&ec[i]<='9')
    {
        ans=ans*10+(ec[i]-'0');
        i++;
    }
    return {ans,--i};
}
void fa()
{
    int x=s.top();
    s.pop();
    if(operatii.top()=='+')s.top()+=x;
    else if(operatii.top()=='-')s.top()-=x;
    else if(operatii.top()=='*')s.top()*=x;
    else if(operatii.top()=='/')s.top()/=x;
    operatii.pop();
}
bool mere(char op1, char op2) 
{
    if(op2=='(')return false;
    if((op1=='+'||op1== '-')&&(op2=='*'||op2=='/'))return false;
    return true;
}
int main() 
{
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    std::string ec;
    fin>>ec;
    for(int i=0;i<ec.length();i++)
    {
        if(ec[i]=='(') 
        {
            operatii.push('(');
        } 
        else if(ec[i]==')') 
        {
            while(operatii.top()!='(')
            {
                fa();
            }
            operatii.pop();
        } 
        else if(ec[i]>='0'&&ec[i]<='9') 
        {
            auto[num,new_i]=numar(ec, i);
            s.push(num);
            i=new_i;
        } 
        else if(ec[i]=='+'||ec[i]=='-'||ec[i]=='*'||ec[i]=='/') 
        {
            while(!operatii.empty() && mere(ec[i],operatii.top())) 
            {
                fa();
            }
            operatii.push(ec[i]);
        }
    }
    while(!operatii.empty()) 
        fa();
        
    fout<<s.top();
    return 0;
}