#include <bits/stdc++.h>
using namespace std;
#define dim 2000001
ifstream fin("evaluare.in");
ofstream fout("evaluare.out");

bool del(char c)
{
    return c==' ';
}

bool is_op(char c)
{
    return c == '+' || c == '-' || c == '*' || c == '/';
}

int priority(char op)
{
    if(op == '+' || op == '-')
        return 1;
    if(op == '*' || op == '/')
        return 2;
    return -1; 
}

void process_op(stack<int>& st, char op)
{
    int r = st.top();
    st.pop();
    int l = st.top();
    st.pop();
    switch(op)
    {
        case '+': st.push(l+r); break;
        case '-': st.push(l-r); break;
        case '*': st.push(l*r); break;
        case '/': st.push(l/r); break;
    }
}

int evaluate(string &s)
{
    stack<int>st;
    stack<char>op;

    for(int i=0;i<s.size();++i)
    {
        if(del(s[i]))
            continue;
        if(s[i] == '(')
            op.push('(');
        else if(s[i] == ')')
        {
            while(op.top()!= '(')
            {
                process_op(st, op.top());
                op.pop();
            }
            op.pop();
        } else if(is_op(s[i]))
        {
            char cur_op = s[i];
            while(!op.empty() && priority(op.top()) >= priority(cur_op))
            {
                process_op(st, op.top());
                op.pop();
            }
            op.push(cur_op);
        }else{
            int number = 0;
            while(i<(int) s.size() && isalnum(s[i]))
            {
                number = number *10 + s[i++]-'0';
            }
            i--;
            st.push(number);
        }
    }

    while(!op.empty())
    {
        process_op(st, op.top());
        op.pop();
    }
    return st.top();
}

int main() 
{
    ios_base::sync_with_stdio(0), fin.tie(0), fout.tie(0);
    string a;
    fin>>a;
    fout<<evaluate(a);
    fin.close();
    fout.close();
    return 0;
}