#include <stack>  
#include <stdio.h>  
#include <string.h>  
using namespace std;  
bool check(char,char);  
void solve();  
char str[205],ch;  
double tmp,a,b;  
int i,len;  
stack<double> v;  
stack<char> c;  
int main()  
    {  
        while(gets(str)!=NULL)  
        {  
            if(!strcmp(str,"0"))  
            {  
                break;  
            }  
            solve();  
        }  
        return 0;  
    }  
void solve()  
    {  
        len=strlen(str);  
        for(i=0;i<len;i++)  
        {  
            if(str[i]==‘ ‘)  
            {  
                continue;  
            }  
            if(str[i]>=‘0‘ && str[i]<=‘9‘)  
            {  
                tmp=0;  
                while(str[i]>=‘0‘ && str[i]<=‘9‘)  
                {  
                    tmp*=10;  
                    tmp+=str[i]-‘0‘;  
                    i++;  
                }  
                v.push(tmp);  
            }  
            if(str[i]==‘+‘ || str[i]==‘-‘ || str[i]==‘*‘ || str[i]==‘/‘)  
            {  
                if(c.empty())  
                {  
                    c.push(str[i]);  
                }else{  
                    ch=c.top();  
                    while(check(ch,str[i]))  
                    {  
                        a=v.top();  
                        v.pop();  
                        b=v.top();  
                        v.pop();  
      
                        c.pop();  
      
                        switch(ch)  
                        {  
                            case ‘+‘:  
                                v.push(a+b);  
                                break;  
                            case ‘-‘:  
                                v.push(b-a);  
                                break;  
                            case ‘*‘:  
                                v.push(a*b);  
                                break;  
                            case ‘/‘:  
                                v.push(b/a);  
                                break;  
                        }  
      
                        if(c.empty())  
                        {  
                            break;  
                        }else{  
                            ch=c.top();  
                        }  
                    }  
                    c.push(str[i]);  
                }  
            }  
        }  
        while(!c.empty())  
        {  
            a=v.top();  
            v.pop();  
            b=v.top();  
            v.pop();  
      
            ch=c.top();  
            c.pop();  
      
            switch(ch)  
            {  
                case ‘+‘:  
                    v.push(a+b);  
                    break;  
                case ‘-‘:  
                    v.push(b-a);  
                    break;  
                case ‘*‘:  
                    v.push(a*b);  
                    break;  
                case ‘/‘:  
                    v.push(b/a);  
                    break;  
            }  
        }  
      
        printf("%.2f\n",v.top());  
        v.pop();  
    }  
bool check(char ch1,char ch2)  
    {  
        if(ch1==‘*‘||ch1==‘/‘)  
        {  
            return true;  
        }  
        if(ch2==‘+‘||ch2==‘-‘)  
        {  
            return true;  
        }  
        return false;  
}