#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  string s;
  cin >> s;
  
  vector<int> x;
  vector<char> v;

  REP (i, s.length()) {
    if (!isdigit(s[i])) {
      v.push_back(s[i]);
      s[i] = ' ';
    }
  }
  
  stringstream ss(s);
  int tmp;
  while (ss >> tmp)
    x.push_back(tmp);

  int ret = x[0];
  REP (i, v.size()) {
    if (v[i] == '*') 
      ret += x[i+1];
    else
      ret *= x[i+1];
  }
  cout << ret << endl;
  
  return 0;
}