#include <iostream>
#include <cstdio>
#include <stack>
using namespace std;

stack<char> operates;
stack<int> numbers;
string formula;

bool isDigit(char c)
{
    return c >= '0' && c <= '9';
}

void getNumbers(int& i, bool minus)
{
    int res = 0;
    while (isDigit(formula[i]))
    {
        res = res * 10 + formula[i] - '0';
        i++;
    }
    i--;
    if (minus) res = -res;
    numbers.push(res);
}

int exp(int a, int b)
{
    int res = 1;
    while (b)
    {
        if (b & 1) res *= a;
        a *= a;
        b >>= 1;
    }
    return res;
}

void calc()
{
    int b = numbers.top();
    numbers.pop();
    int a = numbers.top();
    numbers.pop();
    char c = operates.top();
    operates.pop();
    int res;
    if (c == '+') res = a + b;
    else if (c == '-') res = a - b;
    else if (c == '/') res = a / b;
    else if (c == '*') res = a * b;
    else res = exp(a, b);
    numbers.push(res);
}

int main()
{
    cin >> formula;
    int n = formula.size();
    for (int i = 0; i < n; ++i) formula = "(" + formula;
    formula += ")";

    for (int i = 0; i < formula.size(); ++i)
    {
        char c = formula[i];
        // cout << c << endl;
        if (isDigit(c)) getNumbers(i, false);
        else if (c == '+')
        {
            while (operates.size() && operates.top() != '(') calc();
            operates.push(c);
        }
        else if (c == '-')
        {
            if (isDigit(formula[i+1]) && formula[i-1] == '(') 
            {
                getNumbers(++i, true);
            }   
            else
            {
                while (operates.size() && operates.top() != '(') calc();    
                operates.push(c);
            }   
        } 
        else if (c == '*' || c == '/')
        {
          //  cout << operates.size() << endl;
            while (operates.size() && (operates.top() == '*' || operates.top() == '/' || operates.top() == '^')) calc();
//          cout << operates.size() << endl;
            operates.push(c);
        }
        else if (c == '^') 
        {
            while (operates.size() && operates.top() == '^') calc();
            operates.push(c);
        }
        else if (c == ')')
        {
            while (operates.size() && operates.top() != '(') calc();
            operates.pop();
        }
        else operates.push(c);
    }
    printf("%d", numbers.top()); 
    return 0;
}