#include <bits/stdc++.h>
using namespace std;

#define pb push_back
using ll = long long;
const string fn = "evaluare";

ifstream fin(fn + ".in");
ofstream fout(fn + ".out");

string s;

stack<int> t;
stack<char> op;


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

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

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

void calc(char op){
    int r = t.top(); t.pop();
    int l = t.top(); t.pop();

    if(op == '+') t.push(l + r);
    if(op == '-') t.push(l - r);
    if(op == '*') t.push(l * r);
    if(op == '/') t.push(l / r);

}

int main(){
  
    fin >> s;
    int i = 0;
    for(int i = 0; i < (int)s.size(); ++i){
        if(delim(s[i]))
            continue;
        if(s[i] == '(')
            op.push('(');
        else if(s[i] == ')'){
            while(op.top() != '('){
                calc(op.top());
                op.pop();
            }
            op.pop();
        }
        else if(opr(s[i])){
            char ac_op = s[i];
            while(!op.empty() && priority(op.top()) >= priority(ac_op)){
                calc(op.top());
                op.pop();
            }
            op.push(ac_op);
        }
        else {
            int nr = 0;
            while(i < (int)s.size() && isdigit(s[i]))
                nr = nr * 10 + s[i++] - '0';
            --i;
            t.push(nr);
        }
    }
    while(!op.empty()){
        calc(op.top());
        op.pop();
    }

    fout << t.top() << '\n';

    fin.close();
    fout.close();
    return 0;
}