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

using namespace std;

ifstream input("evaluare.in");
ofstream output("evaluare.out");

int getNextNum(string &expression, int &pos)
{
    int result = 0;
    while(expression[pos] >= '0' && expression[pos] <= '9' && pos < expression.size()){
        result = 10*result + expression[pos] - '0';
        pos++;
    }
    pos--;
    return result;
}

void evaluateOperation(stack<int> &st_num, char operation)
{
    int num1 = st_num.top();
    st_num.pop();
    int num2 = st_num.top();
    st_num.pop();

    if(operation == '+'){
        st_num.push(num2 + num1);
    }
    else if(operation == '-'){
        st_num.push(num2 - num1);
    }
    else if(operation == '*'){
        st_num.push(num2 * num1);
    }
    else{
        st_num.push(num2 / num1);
    }
}

int precedence(char operation)
{
    if(operation == '+' || operation == '-'){
        return 1;
    }
    if(operation == '*' || operation == '/'){
        return 2;
    }

}

int main()
{
    string expression;
    input >> expression;
    stack<int> st_num;
    stack<char> st_op;

    int pos = 0;
    while(pos < expression.size()){

        char next_char = expression[pos];
        int next_num = 0;
        if(next_char >= '0' && next_char <= '9'){
            next_num = getNextNum(expression, pos);
            st_num.push(next_num);
        }
        else if(next_char == '('){
            st_op.push(next_char);
        }
        else if(next_char == ')'){
            while(st_op.top() != '('){
                char operation = st_op.top();
                st_op.pop();
                evaluateOperation(st_num, operation);
            }
            st_op.pop();
        }
        else{
            char op1 = next_char;
            if(!st_op.empty()){
                char op2 = st_op.top();
                while(!st_op.empty() && op2 != '(' && precedence(op2) >= precedence(op1)){
                    op2 = st_op.top();
                    st_op.pop();
                    evaluateOperation(st_num, op2);
                }

            }
            st_op.push(op1);
        }
        pos++;

    }
    while(!st_op.empty()){
        char operation = st_op.top();
        st_op.pop();
        evaluateOperation(st_num, operation);
    }
    output << st_num.top();
    return 0;
}