#include <iostream>
#include <fstream>
#include <queue>
#include <stack>
#include <string.h>
#include <string>
using namespace std;
 
ifstream in("evaluare.in");
ofstream out("evaluare.out");
 
queue<char> infix;
queue<string> postfix;
 
void toPostFix();
int priority(char c);
bool isOperand(char c);
int getNumber(string s);
 
int main(){
 
  char s[100001];
  in.getline(s, 100001);
 
  for(int i = 0; i < strlen(s); i++){
    infix.push(s[i]);
  }
 
  toPostFix();
 
  bool b = false;
 
  stack<int> stack;

  while(!postfix.empty()){
    string st = postfix.front();
    postfix.pop();
    
    int n = 0;

    if(st == "+"){
      int nr1 = stack.top(); stack.pop();
      int nr2 = stack.top(); stack.pop();
      n = nr1 + nr2;
      
      stack.push(n);
    } else if(st == "-"){
      int nr2 = stack.top(); stack.pop();
      int nr1 = stack.top(); stack.pop();
      n = nr1 - nr2;
      stack.push(n);
    } else if(st == "*"){
      int nr2 = stack.top(); stack.pop();
      int nr1 = stack.top(); stack.pop();
      n = nr1 * nr2;
      stack.push(n);
    } else if(st == "/"){
      int nr2 = stack.top(); stack.pop();
      int nr1 = stack.top(); stack.pop();
      n = nr1 / nr2;
      stack.push(n);
    } else {
      int nr = getNumber(st);
      stack.push(nr);
      
    }
 
  }

  out<<stack.top();
 
  return 0;
}
 
void toPostFix(){
 
  stack<char> s;
 
  while(!infix.empty()){
    char c = infix.front();
    infix.pop();
 
    if(isOperand(c)){
 
      int n = (c - '0');
 
      while(isOperand(infix.front())){
        int ch = infix.front();
        n = n * 10 + (int)(ch - '0');
        infix.pop();
      }
     
      string st = to_string(n);
      postfix.push( st );
    } else if(c == '('){
      s.push(c);
    } else if(c == ')') {
      while(s.top() != '('){
        string st(1, s.top());
       
 
        postfix.push( st );
        s.pop();
      }
      s.pop();
    } else {
      while( !s.empty() && priority(s.top()) >= priority(c) ){
        string st(1, s.top());
        postfix.push( st );
        s.pop();
      }
      s.push(c);
    }
 
 
  }
 
  while(!s.empty()){
    string st(1, s.top());
    postfix.push( st );
    s.pop();
  }
 
}
 
bool isOperand(char c){
  if(strchr("+-*/^()", c) != NULL){
    return false;
  }
  return true;
}
 
int priority(char c){
  if(c == '+' || c == '-')
    return 1;
  if(c == '*' || c == '/')
    return 2;
  if(c == '^')
    return 3;
  return -1;
}

int getNumber(string s){
  int n = 0;
  char ch[100] = "";
  strcpy(ch, s.c_str());
  for(int i = 0; i < s.length(); i++){
    int d = ch[i] - '0';
    n = n * 10 + d;
  }

  return n;
}