#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  string S;
  cin >> S;
  deque<int> num, op;
  for (int i = 0; i < (int)S.size(); i++) {
    if (S[i] == '*' || S[i] == '+') {
      op.push_back(S[i]);
    } else {
      int n = 0;
      while (i < (int)S.size() && (S[i] != '*' && S[i] != '+')) {
        n *= 10;
        n += S[i] - '0';
        i++;
      }
      i--;
      num.push_back(n);
    }
  }
  while (!num.empty() && !op.empty()) {
    int a = num.front();
    num.pop_front();
    int b = num.front();
    num.pop_front();
    char c = op.front();
    op.pop_front();
    num.push_front(c == '*' ? a + b : a * b);
  }
  cout << num.front() << '\n';
  return 0;
}