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

#define int long long
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define repi(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define all(x) (x).begin(),(x).end()
#define pb push_back
#define mp make_pair
#define mt make_tuple

typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;

const int inf = 1LL<<60;
const int mod = 1e9 + 7;
const double eps = 1e-9;

/*{
}*/

signed main()
{
  string s;
  cin >> s;

  s += "=";
  int n = s.size();
  int a = 0, b = 0, op = 0;
  rep(i, n){
    if('0' <= s[i] and s[i] <= '9'){
      b = 10*b+s[i]-'0';
    }else{
      if(op == 0) a = a+b;
      else a = a*b;
      b = 0;
      if(s[i] == '*') op = 0;
      else op = 1;
    }
  }

  cout << a << endl;

  return 0;
}