#include <iostream>
#include <stack>
#include <vector>
#include <sstream>
#include <cstring>
using namespace std;
int main()
{
    int result;
    stack<string> op;
    vector<string> postfix;
    stack<int> num;
    string line,str;
    int eval_postfix(vector<string>& post,stack<int>& num1);
    int precedence(string str1);
    getline(cin,line);
    istringstream iss(line);
    while(!iss.eof())
    {
                     iss>>str;
                     if(str=="+"||str=="-"||str=="*"||str=="/")
                     {
                            
                            while(!op.isEmpty()&&op.top()!="("&&precedence(str)>=precedence(op.top()))
                            {
                                                           postfix.push_back(op.top());
                                                           op.pop();
                            }
                            op.push(str);
                     }
                     else if(str=="(")
                     {
                          op.push(str);
                     }
                     else if(str==")")
                     {
                          while(op.top()!="(")
                          {
                              postfix.push_back(op.top());
                              op.pop();
                          }
                          op.pop();
                     }
                     else
                     {
                         postfix.push_back(str);
                     }
                                
    }    
    while(!op.isEmpty())
    {
                      postfix.push_back(op.top());
                      op.pop();
    }
    result=eval_postfix(&postfix,&num);
    cout<<result;
    return 0;
}
int precedence(string str)
{
    if(str=="+"||str=="-")
    return 1;
    else if(str=="*"||str="/")
    return 2;
    else
    return 0;
}
int eval_postfix(vector<string>& postfix,stack<int>& num)
{
    for(vector<string>::const_iterator ptr=postfix.begin();ptr!=postfix.end();++ptr)
    {
                                        
              if(*ptr!=="+"||*ptr!=="-"||*ptr!=="*"||*ptr!=="/")
              {
                                     int number;
                                     number=atoi(*ptr.c_str());
                                     num.push(number);
              }
              else{
                   int arg2=num.top();
                   num.pop();
                   int arg1=num.top();
                   num.pop();
                   int result;
                   if(*ptr=="+")
                   result=arg1+arg2;
                   else if(*ptr=="-")
                   result=arg1-arg2;
                   else if(*ptr=="*")
                   result=arg1*arg2;
                   else
                   result=arg1/arg2;
                   num.push(result);
                   }
     }          
     int i=num.top();
     num.pop();
     return i;
}

#include <iostream>
#include <stack>
#include <vector>
#include <sstream>
#include <string>
using namespace std;
int main()
{
int result;

stack<string> op;
vector<string> postfix;
stack<int> num;

string line,str;

int eval_postfix(vector<string>& post,stack<int>& num1);
int precedence(string str1);
getline(cin,line);
istringstream iss(line);

while(!iss.eof())
{
iss>>str;
if(str=="+"||str=="-"||str=="*"||str=="/")
{

while(!op.empty()&&op.top()!="("&&precedence(str)>=precedence(op.top()))
{
    postfix.push_back(op.top());
    op.pop();
}
op.push(str);
}
else if(str=="(")
{
op.push(str);
}
else if(str==")")
{
while(op.top()!="(")
{
postfix.push_back(op.top());
op.pop();
}
op.pop();
}
else
{
postfix.push_back(str);
}

}
while(!op.empty())
{
postfix.push_back(op.top());
op.pop();
}
result=eval_postfix(postfix,num);
cout<<result;
return 0;
}
int precedence(string str)
{
if(str=="+"||str=="-")
return 1;
else if(str=="*"||str=="/")
return 2;
else
return 0;
}
int eval_postfix(vector<string>& postfix,stack<int>& num)
{
for(vector<string>::const_iterator ptr=postfix.begin();ptr!=postfix.end();++ptr)
{

if(*ptr!="+"||*ptr!="-"||*ptr!="*"||*ptr!="/")
{
int number;
istringstream stm;
stm.str(*ptr);
stm>>number;

//number=atoi(*ptr.c_str());
num.push(number);
}
else{
int arg2=num.top();
num.pop();
int arg1=num.top();
num.pop();
int result;
if(*ptr=="+")
result=arg1+arg2;
else if(*ptr=="-")
result=arg1-arg2;
else if(*ptr=="*")
result=arg1*arg2;
else
result=arg1/arg2;
num.push(result);
}
}
int i=num.top();
num.pop();
return i;
}