//ALEXANDRU MICLEA

#include <vector>
#include <algorithm>
#include <string>
#include <string.h>
#include <cstring>
#include <queue>
#include <map>
#include <set>
#include <unordered_map>
#include <time.h>
#include <iomanip>
#include <deque>
#include <math.h>
#include <cmath>
#include <assert.h>
#include <stack>
#include <bitset>
#include <random>
#include <chrono>
#include <assert.h>

using namespace std;
using ll = long long;

#include <fstream>
//ifstream cin("input.in"); ofstream cout("output.out");
ifstream cin("evaluare.in"); ofstream cout("evaluare.out");


//VARIABLES

string s;

//FUNCTIONS

bool isOp(char c) {
    return c == '+' || c == '-' || c == '/' || c == '*';
}

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

void process_op(stack <int>& st, char op) {
    int r = st.top(); st.pop();
    int l = st.top(); st.pop();

    switch (op) {
        case '+': st.push(l + r); break;
        case '-': st.push(l - r); break;
        case '/': st.push(l / r); break;
        case '*': st.push(l * r); break;
    }
}

int evaluate(string& s) {
    stack <int> st;
    stack <char> op;

    for (int i = 0; i < (int)s.size(); i++) {

        if (s[i] == '(') {
            op.push('(');
        }
        else if (s[i] == ')') {
            while (op.top() != '(') {
                process_op(st, op.top());
                op.pop();
            }
            op.pop();
        }
        else if (isOp(s[i])) {
            char curr_op = s[i];
            while (!op.empty() && priority(op.top()) >= priority(curr_op)) { ///de inteles
                process_op(st, op.top());
                op.pop();
            }
            op.push(curr_op);
        }
        else {
            //citesc ce numar am in fata
            int num = 0;
            while (i < (int)s.size() && isalnum(s[i]))
                num = num * 10 + s[i++] - '0';
            --i;
            st.push(num);
        }
    }

    while (!op.empty()) {
        process_op(st, op.top());
        op.pop();
    }
    return st.top();
}

//MAIN

int main() {

    cin >> s;
    cout << evaluate(s);

    return 0;
}