#include <bits/stdc++.h>
using namespace std;

int precedence(char op) {
    if (op == '+' || op == '-') return 1;
    if (op == '*' || op == '/') return 2;
    return 0;
}

long long applyOp(long long a, long long b, char op) {
    switch (op) {
        case '+': return a + b;
        case '-': return a - b;
        case '*': return a * b;
        case '/': return a / b;
    }
    return 0;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    freopen("evaluare.in", "r", stdin);
    freopen("evaluare.out", "w", stdout);

    string expr;
    getline(cin, expr);

    stack<char> ops;
    vector<string> output;

    for (int i = 0; i < (int)expr.size(); i++) {
        if (isspace((unsigned char)expr[i])) continue;

        if (isdigit((unsigned char)expr[i])) {
            long long val = 0;
            int start = i;
            while (i < (int)expr.size() && isdigit((unsigned char)expr[i])) {
                val = val * 10 + (expr[i] - '0');
                i++;
            }
            i--;
            output.push_back(to_string(val));
        } else if (expr[i] == '(') {
            ops.push(expr[i]);
        } else if (expr[i] == ')') {
            while (!ops.empty() && ops.top() != '(') {
                output.push_back(string(1, ops.top()));
                ops.pop();
            }
            if (!ops.empty()) {
                ops.pop();
            }
        } else {
            while (!ops.empty() && precedence(ops.top()) >= precedence(expr[i])) {
                if (ops.top() == '(') break;
                output.push_back(string(1, ops.top()));
                ops.pop();
            }
            ops.push(expr[i]);
        }
    }

    while (!ops.empty()) {
        output.push_back(string(1, ops.top()));
        ops.pop();
    }

    stack<long long> st;
    for (auto &token : output) {
        if (isdigit((unsigned char)token[0]) || (token.size() > 1 && isdigit((unsigned char)token[1]))) {
            long long val = stoll(token);
            st.push(val);
        } else {
            long long b = st.top(); st.pop();
            long long a = st.top(); st.pop();
            long long result = applyOp(a, b, token[0]);
            st.push(result);
        }
    }

    long long answer = st.top();
    cout << answer << "\n";

    return 0;
}