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

signed main(){
  string S; cin >> S;
  vector< int > val;
  vector< char > op;
  while( not S.empty() ){
    int flag = 0;
    for( int i = 0; i < S.size(); ++i )
      if( S[ i ] == '*' or S[ i ] == '+' ){
        val.emplace_back( stoi( S.substr( 0, i ) ) );
        op.emplace_back( S[ i ] );
        S = S.substr( i + 1 );
        flag = 1;
        break;
      }
    if( not flag )
      val.emplace_back( stoi( S ) ),
      S = "";
  }
  int ans = val[ 0 ];
  for( int i = 0; i < op.size(); ++i ){
    if( op[ i ] == '*' )
      ans += val[ i + 1 ];
    else
      ans *= val[ i + 1 ];
  }
  cout << ans << endl;
  return 0;
}