#include <iostream>
#include <vector>
#include <string>
#include <stack>
#include <fstream>

using namespace std;

class ExprEvaluator {
private:

    vector<string> OPERATORS;
    bool isOperator(char);
    int opPriority(char);
    int evaluateSubExpr(int, int, char);

public:
    
    ExprEvaluator();
    int evaluateExpr(const string &);
};

bool ExprEvaluator::isOperator(char chr) {
    for (int i = 0; i < this->OPERATORS.size(); i++) {
        if (this->OPERATORS[i].find(chr) != string::npos)
            return true;
    }
    return false;
}

int ExprEvaluator::opPriority(char oper) {
    for (int i = 0; i < this->OPERATORS.size(); i++) {
        if (this->OPERATORS[i].find(oper) != string::npos)
            return i;
    }
    return -1;
}

int ExprEvaluator::evaluateSubExpr(int operand1, int operand2, char oper) {
    if (oper == '/') {
        return operand1 / operand2;
    } else if (oper == '*') {
        return operand1 * operand2;
    } else if (oper == '-') {
        return operand1 - operand2;
    } else {
        return operand1 + operand2;
    }
}

ExprEvaluator::ExprEvaluator() {
    //this->OPERATORS = {"/*", "-+"};
     this->OPERATORS.push_back("/*");
     this->OPERATORS.push_back("-+");
}

int ExprEvaluator::evaluateExpr(const string & expr) {
    stack<int> operands_stack;
    stack<char> operators_stack;
    int expr_pos = 0;

    while (expr_pos < expr.size()) {

        if (isdigit(expr[expr_pos])) {

            int number = expr[expr_pos] - '0';
            expr_pos += 1;

            while (expr_pos < expr.size() && isdigit(expr[expr_pos])) {
                number = number * 10 + expr[expr_pos] - '0';
                expr_pos += 1;
            }

            operands_stack.push(number);

        } else if (this->isOperator(expr[expr_pos])) {

            if (operators_stack.empty() or operators_stack.top() == '(' or
            this->opPriority(expr[expr_pos]) < this->opPriority(operators_stack.top())) {

                operators_stack.push(expr[expr_pos]);

            } else {
                int priority = this->opPriority(expr[expr_pos]);

                while (!operators_stack.empty() && operators_stack.top() != '(' &&
                priority >= this->opPriority(operators_stack.top())) {
                    
                    char oper = operators_stack.top();  operators_stack.pop();
                    int operand2 = operands_stack.top();  operands_stack.pop();
                    int operand1 = operands_stack.top();  operands_stack.pop();
                    operands_stack.push(
                        this->evaluateSubExpr(operand1, operand2, oper)
                    );
                }
                operators_stack.push(expr[expr_pos]);
            }

            expr_pos += 1;

        } else if (expr[expr_pos] == '(') {

            operators_stack.push('(');
            expr_pos += 1;

        } else { // expr[expr_pos] == ')'

            while (operators_stack.top() != '(') {
                char oper = operators_stack.top();  operators_stack.pop();
                int operand2 = operands_stack.top();  operands_stack.pop();
                int operand1 = operands_stack.top();  operands_stack.pop();
                operands_stack.push(
                    this->evaluateSubExpr(operand1, operand2, oper)
                );
            }
                
            operators_stack.pop();
            expr_pos += 1;

        }
    }

    while (!operators_stack.empty()) {
        char oper = operators_stack.top();  operators_stack.pop();
        int operand2 = operands_stack.top();  operands_stack.pop();
        int operand1 = operands_stack.top();  operands_stack.pop();
        operands_stack.push(
            this->evaluateSubExpr(operand1, operand2, oper)
        );
    }

    return operands_stack.top();
}

int main() {
    string expr;

    ifstream inputFile("evaluare.in");
    inputFile >> expr;
    inputFile.close();

    ExprEvaluator evaluator;
    int ans = evaluator.evaluateExpr(expr);

    ofstream outputFile("evaluare.out");
    outputFile << ans;
    outputFile.close();

    return 0;
}