#include<iostream>
#include<cstring>
#include<algorithm>
#include<stack>
#include<unordered_map>

using namespace std;

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

void eval()
{
    auto b = num.top(); num.pop();
    auto a = num.top(); num.pop();
    auto c = op.top();  op.pop();
    int x;
    if(c == '+') x = a + b;
    else if(c == '-') x = a - b;
    else if(c == '*') x = a * b;
    else x = a/b;
    num.push(x);
}

int main()
{
    unordered_map<char,int> pr{{'+',1},{'-',1},{'*',2},{'/',2}};
    string str;
    cin>>str;
    for(int i = 0;i < str.size();i ++)
    {
        auto c = str[i];
        if(isdigit(c))
        {
            int x = 0 , j = i;
            while(isdigit(str[j]) && j < str.size())
                x = x * 10 + str[j ++] - '0';
            i = j - 1;
            num.push(x);
        }
        else if(c == '(')   op.push(c);
        else if(c == ')')
        {
            while(op.top() != '(')  eval();
            op.pop();
        }
        else
        {
            while(op.size() && pr[op.top()] >= pr[c])   eval();
            op.push(c);
        }

    }
    while(op.size()) eval();
    cout<<num.top()<<endl;
    return 0;
}