#include <iostream>
#include <stack>
#include <unordered_map>

using namespace std;

stack<char> op;
stack<int> num;

void eval()
{
    auto b = num.top(); num.pop();
    auto a = num.top(); num.pop();
    auto c = op.top(); op.pop();
    int k = 0;
    if(c == '+')    k = a + b;
    else if(c == '-') k = a - b;
    else if(c == '*') k = a * b;
    else k = a / b;
    num.push(k);
}
int main()
{
    string s;
    cin >> s;

    unordered_map<char, int> pr{{'+', 1}, {'-', 1}, {'*', 2}, {'/', 2}};

    for(int i = 0;i < s.size(); i ++)
    {
        if(isdigit(s[i]))
        {
            int x = 0, j = i;
            while(j < s.size() && isdigit(s[j]))
                x = x * 10 + s[j ++] - '0';
            num.push(x);
            i = j - 1;
        }
        else if(s[i] == '(') op.push(s[i]);
        else if(s[i] == ')')
        {
            while(op.top() != '(')    eval();
            op.pop();
        }
        else
        {
            while(op.size() && op.top() != '(' && pr[s[i]] <= pr[op.top()])
                eval();

            op.push(s[i]);
        }
    }
    while(op.size()) eval();

    cout << num.top() << endl;
}