#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

ifstream fin ("evaluare.in");
ofstream fout ("evaluare.out");

string s;
stack<ll>st;
stack<char>op;

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

void process(stack<ll> &st , char op){
  ll r = st.top(); st.pop();
  ll 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 priority (char op){
  if (op == '+' || op == '-'){
    return 1;
  }
  if (op == '*' || op == '/'){
    return 2;
  }
  return 0;
}

ll evaluate (string &s){
  for (int i=0; i<(int)s.size(); i++){
    if (s[i] == ' '){
      continue;
    }
    if (s[i] == '('){
       op.push(s[i]);
    }
    else if (s[i] == ')'){
      while (op.top() != '('){
        process(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(st , op.top());
        op.pop();
      }
      op.push(cur_op);
    }
    else{
      ll number = 0;
      while (i < (int)s.size() && isdigit(s[i])){
        number = number * 10 + (s[i] - '0');
        i += 1;
      }
      --i;
      st.push(number);
    }
  }
  while (!op.empty()){
    process(st , op.top());
    op.pop();
  }
  return st.top();
}

int main(){
  ios_base::sync_with_stdio(false);
  fin >> s;
  fout << evaluate(s);
}