#include <iostream>
#include <cstdlib>
#include <string>

using namespace std;

bool isNumber(string value) {
  //if the first character is a number
  if(value[0] >= '0' && value[0] <= '9')
    return true;
  else
    return false;
}


double convert(string value){
  return atof(value.c_str());
}

double apply(string op, double x, double y) {
  if(op == "+") {
    return x + y;
  }
  else if(op == "-") {
    return x - y;
  }
  else if(op == "/") {
    return x / y;
  }
  else if(op == "*") {
    return x * y;
  }
}


int main(void) {
  double s[700];
  int top=0;

  do {
    string value;
    //read the value
    cin >> value;

    if(isNumber(value)) {
      s[top++] = convert(value);
    } else if(value[0] == '.') {
      //print result
      cout << "Result: " << s[top-1] <<endl;
      top =0;
    } else {
      double y = s[--top];
      double x = s[--top];
      s[top++] = apply(value, x, y);
    }
  } while(top);  //stop on empty stack


  return 0 ;
}