#include <fstream>
#include <string>
#include <stack>
using namespace std;

struct operation{
    char operation;
    int priority;
};

int main(){

    iostream::sync_with_stdio(false);
    ifstream fin("evaluare.in");
    ofstream fout("evaluare.out");

    int result = 0, currentOperandPriority, currentExpressionPriority = 0, currentNumber = 0;
    operation currentOp;
    string input;

    getline(fin, input);

    stack <int> stackNumbers;
    stack <char> stackDigits;
    stack <operation> stackOperators;

    for(int i = input.length() - 1; i >= 0; i--)

        if(input[i] <= '9' && input[i] >= '0')
            stackDigits.push(input[i]);

        else{

            currentNumber = 0;
            bool newNumber = false;

            while(!stackDigits.empty()){
                newNumber = true;
                currentNumber = currentNumber*10 + stackDigits.top() - '0';
                stackDigits.pop();
            }
            if(newNumber)
                stackNumbers.push(currentNumber);


            if(input[i] == '-' || input[i] == '*' || input[i] == '/' || input[i] == '+'){

                if(input[i] == '*' || input[i] == '/')
                    currentOperandPriority = currentExpressionPriority + 2;
                else
                    currentOperandPriority = currentExpressionPriority + 1;

                if(stackOperators.empty() || stackOperators.top().priority <= currentOperandPriority){

                    currentOp.operation = input[i];
                    currentOp.priority = currentOperandPriority;
                    stackOperators.push(currentOp);

                } else {
                        while(!stackOperators.empty() && (currentOp = stackOperators.top()).priority > currentOperandPriority) {

                        stackOperators.pop();

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

                        int res;

                        if(currentOp.operation == '+')
                            res = operand1 + operand2;
                        else if (currentOp.operation == '-')
                            res = operand1 - operand2;
                        else if (currentOp.operation == '/')
                            res = operand1 / operand2;
                        else if (currentOp.operation == '*')
                            res = operand1 * operand2;

                        stackNumbers.push(res);
                    }

                    currentOp.operation = input[i];
                    currentOp.priority = currentOperandPriority;
                    stackOperators.push(currentOp);
                }
            }

            else if(input[i] == '('){
                currentExpressionPriority--;
            }

            else if(input[i] == ')'){
                currentExpressionPriority++;
            }

        }

    while(!stackOperators.empty()){
        currentOp = stackOperators.top();
        stackOperators.pop();
        int operand1 = stackNumbers.top();
        stackNumbers.pop();
        int operand2 = stackNumbers.top();
        stackNumbers.pop();

        int res;

        if(currentOp.operation == '+')
            res = operand1 + operand2;
        else if (currentOp.operation == '-')
            res = operand1 - operand2;
        else if (currentOp.operation == '/')
            res = operand1 / operand2;
        else if (currentOp.operation == '*')
            res = operand1 * operand2;

        stackNumbers.push(res);
    }

    fout<<stackNumbers.top() << "\n";
}