#include <bits/stdc++.h>
using namespace std;

int main() {
  string S, tmp;
  cin >> S;
  S += ' ';
  vector<int> V;
  for (int i = 0; i < S.size(); i++) {
    if (isdigit(S.at(i))) tmp += S.at(i);
    else {
      V.push_back(stoi(tmp));
      tmp = "";
    }
  }
  int ans = V.at(0);
  for (int i = 0, j = 1; i < S.size(); i++) {
    if (S.at(i) == '*') ans += V.at(j), j++;
    if (S.at(i) == '+') ans *= V.at(j), j++;
  }
  cout << ans << "\n";
}