#include <bits/stdc++.h>
#define pb push_back
#define MAX 100000
#define mp make_pair
#define mod 1000000007
#define ll long long
#define ull unsigned long long
#define fastio ios_base::sync_with_stdio(NULL),cin.tie(NULL),cout.tie(NULL);
#define FILES freopen("evaluare.in","r",stdin);\
              freopen("evaluare.out","w",stdout);
#define int ll
using namespace std;
string a;
int eval(int a,int b,char c)
{
    if(c == '+') return a + b;
    if(c == '-') return a - b;
    if(c == '*') return a * b;
    if(c == '/') return a / b;
}
int rang(char c)
{
    if(c == '+' || c == '-')
        return 1;
    if(c == '*' || c == '/')
        return 2;
    return 0;
}
signed main()
{
    fastio
    FILES
    cin >> a;
    stack<char>s;
    stack<int> nr;
    for(int i = 0; i < a.size(); ++i)
    {
        if(a[i] == '(')
        {
            s.push('(');
            continue;
        }
        if(a[i] == '+' || a[i] == '-' || a[i] == '*' || a[i] == '/')
        {
            while(!s.empty() && rang(s.top()) >= rang(a[i]))
            {
                int x = nr.top();
                nr.pop();
                int y = nr.top();
                nr.pop();
                char semn = s.top();
                s.pop();
                nr.push(eval(y,x,semn));
            }
            s.push(a[i]);
            continue;
        }
        if(a[i] == ')')
        {
            while(s.top() != '(')
            {
                int x = nr.top();
                nr.pop();
                int y = nr.top();
                nr.pop();
                char semn = s.top();
                s.pop();
                nr.push(eval(y,x,semn));
            }
            s.pop();
        }
        if(a[i] >= '0' && a[i] <= '9')
        {
            int nu = 0;
            while(i < a.size() && a[i] >= '0' && a[i] <= '9')
                nu = nu * 10 + a[i] - '0',i++;
            nr.push(nu);
            i--;
            continue;
        }
    }
    while(!s.empty())
    {
        int x = nr.top();
        nr.pop();
        int y = nr.top();
        nr.pop();
        char semn = s.top();
        s.pop();
        nr.push(eval(y,x,semn));
    }
    cout << nr.top();
}