#include <iostream>
#include <fstream>
#include <stack>
#include <cstring>

using namespace std;

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

char expr[100002];
stack < int > opz; /// operanzi
stack < char > opt; /// operatori

int get_priority(char op){
    if(op == '+' || op == '-'){
        return 1;
    }
    if(op == '*' || op == '/'){
        return 2;
    }
    return 0;
}

int eval_expr(int op1, int op2, char op){
    if(op == '+'){
        return op1 + op2;
    }
    if(op == '-'){
        return op1 - op2;
    }
    if(op == '*'){
        return op1 * op2;
    }
    return op1 / op2;
}

void solve_last_operation(){
    char oprtor = opt.top();
    opt.pop();

    int operand2 = opz.top();
    opz.pop();
    int operand1 = opz.top();
    opz.pop();

    int res = eval_expr(operand1, operand2, oprtor);
    ///cout << operand1 << " " << op2 << " " << op << " -> ";
    opz.push(res);
}

void solve_parenthesis(){
    while(opt.top() != '('){
        solve_last_operation();
    }
    opt.pop();
}

int main()
{
    fin >> expr;

    int len = strlen(expr);
    expr[len] = ')';
    expr[len + 1] = 0;

    opt.push('(');
    for(int i = 0; i <= len; i++){
        if(expr[i] == '('){
            opt.push(expr[i]);
        }else if(expr[i] == ')'){
            solve_parenthesis();
        }else if(isdigit(expr[i])){
            if(i > 0 && isdigit(expr[i - 1])){
                int top_stack = opz.top();
                opz.pop();
                int new_number = top_stack * 10 + (expr[i] - '0');
                opz.push(new_number);
            }else{
                opz.push(expr[i] - '0');
            }
        }else{
           if(opt.top() == '('){
                opt.push(expr[i]);
           }else{
                while(get_priority(expr[i]) <= get_priority(opt.top())){
                    solve_last_operation();
                }
                opt.push(expr[i]);
           }
        }
    }
    fout << opz.top();
    return 0;
}