#include <iostream>
#include <string>
#include <sstream>

using namespace std;

template <typename Iterator> float F(Iterator begin, Iterator end)
{     
 Iterator i;
 if ((i = find(begin,end,'+')) != end) {
 return F(begin,i-1) + F(i+1,end) ;
 }else if ((i = find(begin,end,'-')) != end) {
 return F(begin,i-1) - F(i+1,end) ;
 }else if ((i = find(begin,end,'*')) != end) {
 return F(begin,i-1) * F(i+1,end) ;
 }else if ((i = find(begin,end,'/')) != end) {
 return F(begin,i-1) / F(i+1,end) ;  
 }else { string str1(begin,end) ;
               istringstream stream(str1);
               float i;
               stream >> i;
               return  i ;
              
      }

}

int main() 
{
    string str;
    float a;
    getline(cin,str);
    a = F(str.begin(),str.end());
    cout << "Ats: " << a << endl;
    cin.get();
}