#include <bits/stdc++.h>
using namespace std;
using lint = long long int;
template<class T = int> using V = vector<T>;
template<class T = int> using VV = V< V<T> >;
template<class T> void assign(V<T>& v, int n, const T& a = T()) { v.assign(n, a); }
template<class T, class... Args> void assign(V<T>& v, int n, const Args&... args) { v.resize(n); for (auto&& e : v) assign(e, args...); }


using Itr = string::const_iterator;
int expr(Itr& itr);
int num(Itr& itr);

int expr(Itr& itr) {
  int res = num(itr);
  while (true) {
    if (*itr == '*') res += num(++itr);
    else if (*itr == '+') res *= num(++itr);
    else break;
  }
  return res;
}

int num(Itr& itr) {
  int res = 0;
  while (isdigit(*itr)) {
    res = res * 10 + *itr - '0';
    ++itr;
  }
  return res;
}

int main() {
  cin.tie(nullptr); ios_base::sync_with_stdio(false);
  string s; cin >> s;
  Itr itr = cbegin(s);
  cout << expr(itr) << '\n';
}