#include <iostream>
#include <fstream>
#include <stack>
#include <string>
using namespace std;
ifstream fin("evaluare.in");
ofstream fout("evaluare.out");
string exp, pol;

int priority(char c) {
    if (c == '(')
        return 0;
    if (c == '-' || c == '+')
        return 1;
    return 2;
}

void genFormaPoloneza(string s) {
    stack<char> oper;
    int poz = 0;

    while (poz < s.length()) {
        if (isdigit(s[poz])) {
            pol += s[poz];
            while (poz + 1 < s.length() && isdigit(s[poz + 1]))
                pol += exp[++poz];
            pol += '.';
        } else if (s[poz] == '(') {
            oper.push('(');
        } else if (s[poz] == ')') {
            while (oper.top() != '(')
                pol += oper.top(), oper.pop();
            oper.pop();
        } else {
            while (!oper.empty() && priority(oper.top()) >= priority(s[poz]))
                pol += oper.top(), oper.pop();
            oper.push(s[poz]);
        }
        poz++;
    }

    while (!oper.empty())
        pol += oper.top(), oper.pop();
}

int evalPol(string s) {
    stack<int> num;
    int poz = -1;

    while (++poz < s.length()) {
        if (isdigit(s[poz])) {
            int nr = 0;
            do {
                nr = nr = nr * 10 + s[poz] - '0';
            } while (poz < s.length() && isdigit(s[++poz]));

            num.push(nr);
        } else {
            int nr = num.top();
            num.pop();

            if (s[poz] == '+')
                num.top() += nr;
            else if (s[poz] == '-')
                num.top() -= nr;
            else if (s[poz] == '*')
                num.top() *= nr;
            else if (s[poz] == '/')
                num.top() /= nr;
        }
    }

    return num.top();
}

int main() {
    fin >> exp;
    genFormaPoloneza(exp);
    fout << evalPol(pol);
    return 0;
}