#include <fstream>
#include <vector>
using namespace std;
ifstream fin("evaluare.in");
ofstream fout("evaluare.out");

const int szmax = 100000;

char s[szmax + 5];
int pr[300];


vector <int> st_nr;
vector <char> st_op;

int get_number(int& pos)
{
    int nr = 0;
    while(isdigit(s[pos]))
        nr=nr*10 + s[pos++]-'0';
    return nr;
}

void resolve_operation()
{
    int b=st_nr.back();
    st_nr.pop_back();
    int a = st_nr.back();
    st_nr.pop_back();
    if(st_op.back()=='+')
        st_nr.push_back(a+b);
    else if(st_op.back()=='-')
        st_nr.push_back(a-b);
    else if(st_op.back()=='*')
        st_nr.push_back(a*b);
    else if(st_op.back()=='/')
        st_nr.push_back(a/b);
    st_op.pop_back();
}

int main()
{
    pr['+']=1;
    pr['-']=1;
    pr['*']=2;
    pr['/']=2;
    fin>>s;

    int ind = 0;
    while(s[ind])
    {

        if(s[ind]=='(')
        {
            st_op.push_back('(');
            ++ind;
            continue;
        }
        if(s[ind]==')')
        {
            while(st_op.back()!='(')
                resolve_operation();
            st_op.pop_back();
            ++ind;
            continue;
        }
        if(isdigit(s[ind]))
        {
            st_nr.push_back(get_number(ind));
            continue;
        }
        else
        {
            while(st_op.empty()==false && pr[st_op.back()]>=pr[s[ind]])
                resolve_operation();
            st_op.push_back(s[ind]);
            ++ind;
            continue;
        }
    }

    while(!st_op.empty())
        resolve_operation();

    fout<<st_nr.front();


}