#include<iostream>
#include<fstream>
#include<string>
#include<cctype>
#include<stack>
using namespace std;
fstream fin("evaluare.in",ios::in),fout("evaluare.out",ios::out);
stack<char> op;
stack<int> nr;
string s;
int p[200],ls;
int numar(int&i)
{
    int num=0;
    while(i<ls && isdigit(s[i]))
    {
        num=num*10+(s[i]-'0');
        i++;
    }
    return num;
}
void calc(char oper)
{
    int a,b,c;
    b=nr.top();nr.pop();
    a=nr.top();nr.pop();
    if(oper=='-') nr.push(a-b);
    if(oper=='+') nr.push(a+b);
    if(oper=='/') nr.push(a/b);
    if(oper=='*') nr.push(a*b);
}
int solv()
{
    int i,j;
    ls=s.size();
    for(i=0;i<ls;i++)
    {
        if(isdigit(s[i]))
        {
            nr.push(numar(i));
            i--;
        }
        else
        {
            if(s[i]=='(')
                op.push('(');
            else
            {
                if(s[i]==')')
                {
                    while(op.top()!='(')
                    {
                        calc(op.top());
                        op.pop();
                    }
                    op.pop();
                }
                else
                {
                    while(!op.empty() && p[op.top()]>=p[s[i]])
                    {
                        calc(op.top());
                        op.pop();
                    }
                    op.push(s[i]);
                }
            }
        }
    }
    while(!op.empty())
    {
        calc(op.top());
        op.pop();
    }
    return nr.top();
}
int main()
{
    int i,j;
    p['/']=2;
    p['*']=2;
    p['+']=1;
    p['-']=1;
    p['(']=0;
    p[')']=0;
    fin>>s;
    fout<<solv();
}