#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

int main(){
  string S; cin >> S;
  S += "!";
  vector<int> A;
  vector<char> B;
  int hold = 0, i = 0;
  while(true){
    if(S[i] == '!'){
      A.push_back(hold);
      break;
    }
    if(S[i] == '*' or S[i] == '+'){
      A.push_back(hold);
      B.push_back(S[i]);
      hold = 0;
    }else{
      hold *= 10;
      hold += S[i]-'0';
    }
    i++;
  }
  for(int i = 0; i < (int)B.size(); i++){
    if(B[i] == '*') A[i+1] += A[i];
    else A[i+1] *= A[i];
  }
  cout << A[(int)A.size()-1] << endl;
}