#include <bits/stdc++.h>
using namespace std;
ifstream fin("evaluare.in");
ofstream fout("evaluare.out");
string tokens;
int n;
stack<char> ops;
stack<int> nr;
int prioritate(char c)
{
    if (c == '-'||c == '+')
        return 1;
    if (c == '*'||c == '/')
        return 2;
    return 0;
}
int culcal(int a,int b,char c)
{
    switch(c){
    case '+': return a+b;
    case '-': return a-b;
    case '*': return a*b;
    case '/': return a/b;
    }
}
int evalexp()
{
    int i = 0;
    int val1,val2,val;
    n = tokens.size();
    while (i != n)
    {
        if (tokens[i] == ' ')
            continue;
        if (tokens[i] == '(') ops.push(tokens[i]);
        else if (isdigit(tokens[i]))
        {
            val = 0;
            while(tokens[i] != '\n' && isdigit(tokens[i]))
            {
                val = val * 10 + (tokens[i] - '0');
                i ++;
            }
            i --;
            nr.push(val);
        }
        else if (tokens[i] == ')')
        {
           while(!ops.empty() && ops.top()!='(')
           {
               val2 = nr.top();
               nr.pop();
               val1 = nr.top();
               nr.pop();
               nr.push(culcal(val1,val2,ops.top()));
               //fout << culcal(val1,val2,ops.top()) << '\n';
               ops.pop();
           }
           if (!ops.empty())
              ops.pop();
        }
        else{
            char op,op1;
            op = tokens[i];
            while (!ops.empty() && prioritate(op) <= prioritate(ops.top()))
            {
                val2 = nr.top();
                nr.pop();
                val1 = nr.top();
                nr.pop();
                op1 = ops.top();
                ops.pop();
                nr.push(culcal(val1,val2,op1));
                //fout << culcal(val1,val2,op1) << '\n';
            }
            ops.push(op);
        }
        i++;
    }
    while(!ops.empty())
    {
        val2 = nr.top();
        nr.pop();
        val1 = nr.top();
        nr.pop();
        nr.push(culcal(val1,val2,ops.top()));
        //fout << culcal(val1,val2,ops.top()) << '\n';
        ops.pop();
        if (!ops.empty())
            if (ops.top() == '(') ops.pop();
    }
    return nr.top();
}
int main()
{
    getline(fin,tokens);
    fout << evalexp() << '\n';
    return 0;
}