#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
signed main(){
  string s;
  cin>>s;
  s='*'+s;
  Int n=s.size();
  Int ans=0;
  for(Int i=0;i<n;){
    char c=s[i++];
    Int res=0;
    while(i<n&&isdigit(s[i]))
      res=res*10+(s[i++]-'0');
    if(c=='*') ans+=res;
    if(c=='+') ans*=res;
  }
  cout<<ans<<endl;
  return 0;
}