#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  string s;
  cin >> s;
  s.push_back('_');
  int ans = 0;
  string t = "";
  int state = 0;
  for (char c : s) {
    if (isdigit(c)) t += c;
    else {
      if (state == 0) {
        ans = stoi(t);
      }
      if (state == 1) {
        ans += stoi(t);
      }
      if (state == 2) {
        ans *= stoi(t);
      }
      state = (c == '*' ? 1 : 2);
      t = "";
    }
  }
  cout << ans << endl;
  return 0;
}