#include <bits/stdc++.h>

using namespace std;

ifstream f("evaluare.in");
ofstream g("evaluare.out");

bool delim(char c) {
    return c == ' ';
}

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

int priority(char op) {
    if (op == '+' || op == '-')
        return 1;
    if (op == '*' || op == '/')
        return 2;
    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 < s.size(); i++) {
        if (delim(s[i]))
            continue;
        
        if (s[i] == '(')
            op.push('(');
        else if (s[i] == ')') {
            while (op.top() != '(') {
                process_op(st, op.top());
                op.pop();
            }
            op.pop();
        } else if (is_op(s[i])) {
            char curr_op = s[i];
            while (!op.empty() && priority(op.top()) >= priority(curr_op)) {
                process_op(st, op.top());
                op.pop();
            }
            op.push(curr_op);
        } else {
            int num = 0;
            while (i < s.size() && s[i] >= '0' && s[i] <= '9')
                num = num * 10 + (s[i++] - '0');
            i--;
            st.push(num);
        }
    }
    
    while (!op.empty()) {
        process_op(st, op.top());
        op.pop();
    }
    return st.top();
}

int main() {
    f >> s;
    g << evaluate(s);
    
    f.close();
    g.close();
    return 0;
}