#include <iostream>
#include <unordered_map>
#include <stack>
using namespace std;

stack<int> num;
stack<char> op;
unordered_map<char, int> mp = {{'(', 0}, {'+', 1}, {'-', 1}, {'*', 2}, {'/', 2}};

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

int main(){
    string str;
    cin >> str;
    for (int i = 0; i < str.size(); i ++ ){
        char t = str[i];
        if(isdigit(t)){
            int j = i;
            int x = 0;
            while(j < str.size() && isdigit(str[j])){
                x = x * 10 + str[j] - '0';
                j++;
            }
            i = j - 1;
            num.push(x);
        }else if(t == '(')op.push('(');
        else if(t == ')'){
            while(op.top() != '(') eval();
            op.pop();
        }else{
            while(op.size() && mp[t] <= mp[op.top()]) eval();
            op.push(t);
        }
    }
    while(op.size()) eval();
    cout << num.top();
    return 0;
}