import java.io.*;
import java.util.*;
public class Polonaise {
public static void main(String[] args) throws IOException {
double g,d;
Double value;
Stack stack = new Stack();
StreamTokenizer in =
new StreamTokenizer(new InputStreamReader(System.in));
in.wordChars('+','+'); in.wordChars('-','-'); in.wordChars('/','/');
in.wordChars('*','*');
in.eolIsSignificant(false);
loop: do {
in.nextToken();
if (in.ttype==StreamTokenizer.TT_NUMBER) {
stack.push(new Double(in.nval));
continue loop;
}
if (in.ttype==StreamTokenizer.TT_WORD) {
if (in.sval.length()==1) {
switch (in.sval.charAt(0)) {
case '+':
try{
value = new Double(((Double)stack.pop()).doubleValue() +
((Double)stack.pop()).doubleValue());
stack.push(value);
System.out.println(value);
} catch(EmptyStackException e) {
System.out.println("Pile vide !");
}
continue loop;
}
}
}
} while (in.ttype!=StreamTokenizer.TT_EOF);
}
}