#include <stdlib.h>
#include<iostream>
#include<string>
#include<iomanip>
#include<stdio.h>
#include<cmath>
using namespace std;
#include "list.cpp"
#include "stack.h"

double sum(double rhs, double lhs);
double subtract(double rhs, double lhs);
double mult(double rhs, double lhs);
double quotient(double rhs, double lhs);
double power(double rhs, double lhs);

int main(){
    Stack<double> astack;
    double d, rhs, lhs, res;
    char ch;

    while(cin.peek() != EOF) {
        cin >> ch;
        if(isspace(ch))
            cin.ignore();

        if(isdigit(ch) || ch == '.') {
            d = ch;
            astack.push(d);
        }

        switch(ch) {
            case '+':
                rhs = astack.pop();
                lhs = astack.pop();
                astack.push(sum(rhs, lhs));
                break;
            case '-':
                rhs = astack.pop();
                lhs = astack.pop();
                astack.push(subtract(rhs, lhs));
                break;
            case '*':
                rhs = astack.pop();
                lhs = astack.pop();
                astack.push(mult(rhs, lhs));
                break;
            case '/':
                rhs = astack.pop();
                lhs = astack.pop();
                astack.push(quotient(rhs, lhs));
                break;
            case '^':
                rhs = astack.pop();
                lhs = astack.pop();
                astack.push(power(rhs, lhs));
                break;
            default:
                cerr << "Error. Invalid expression" << endl;
        }
    }

    res = astack.pop();
    cout << fixed << showpoint << setprecision(6) << res << endl;

    return 0;
}//main

double sum(double rhs, double lhs) {
    return lhs + rhs;
}
double subtract(double rhs, double lhs) {
    return lhs - rhs;
}
double mult(double rhs, double lhs) {
    return lhs * rhs;
}
double quotient(double rhs, double lhs) {
    return lhs / rhs;
}
double power(double rhs, double lhs) {
    return pow(lhs, rhs);
}