#include <fstream>
#include <stack>
#include <vector>

using namespace std;

ifstream cin("evaluare.in");
ofstream cout("evaluare.out");

string s;

inline int Precedence(char ch)
{
    if (ch == '^')
        return 3;
    if (ch == '*' || ch == '/')
        return 2;
    return 1;
}

inline void InfixToPostfix()
{
    int i;
    string t;
    stack<char> st;
    for (i = 0; s[i]; ++i)
        if (isdigit(s[i]) || (s[i]=='-' && (!i || s[i-1]=='(') && isdigit(s[i+1])))
        {
            if (s[i] == '-')
            {
                t.push_back('-');
                ++i;
            }
            while (isdigit(s[i]))
            {
                t.push_back(s[i]);
                ++i;
            }
            t.push_back(' ');
            --i;
        }
        else if (s[i] == '(')
            st.push('(');
        else if (s[i] == ')')
        {
            while (st.top() != '(')
            {
                t.push_back(st.top());
                t.push_back(' ');
                st.pop();
            }
            st.pop();
        }
        else
        {
            while (!st.empty() && st.top() != '(' && Precedence(s[i]) <= Precedence(st.top()))
            {
                t.push_back(st.top());
                t.push_back(' ');
                st.pop();
            }
            st.push(s[i]);
        }
    while (!st.empty())
    {
        t.push_back(st.top());
        t.push_back(' ');
        st.pop();
    }
    s = t;
}

inline int Power(int b, int e)
{
    int ans;
    ans = 1;
    while (e)
    {
        if (e % 2)
            ans = ans * b;
        b = b * b;
        e /= 2;
    }
    return ans;
}

inline int Calc(int a, int b, char op)
{
    if (op == '^')
        return Power(a, b);
    if (op == '*')
        return a * b;
    if (op == '/')
        return a / b;
    if (op == '+')
        return a + b;
    return a - b;
}

inline int Evaluate()
{
    int i, sign, x;
    vector<int> st;
    for (i = 0; s[i]; ++i)
        if (isdigit(s[i]) || (s[i]=='-' && isdigit(s[i+1])))
        {
            if (s[i] == '-')
            {
                sign = -1;
                ++i;
            }
            else
                sign = 1;
            x = 0;
            while (isdigit(s[i]))
            {
                x = x * 10 + s[i] - '0';
                ++i;
            }
            st.push_back(sign * x);
            --i;
        }
        else if (s[i] != '(' && s[i] != ')' && s[i]!=' ')
            //while (st.size() >= 2)
            {
                x = Calc(st[st.size() - 2], st[st.size() - 1], s[i]);
                st.pop_back(), st.pop_back();
                st.push_back(x);
            }
    return st.back();
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr), cout.tie(nullptr);
    cin >> s;
    cin.close();
    InfixToPostfix();
    cout << Evaluate();
    cout.close();

    return 0;
}