#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>

#define STACK_SIZE 100

struct stack{
    float values[STACK_SIZE];
    int size;
};

int main(){
    struct stack mystack;
    memset(&mystack,0,sizeof(struct stack));
    char vstup[STACK_SIZE];
    int counter = 0;
    while(1){
        fgets(vstup, STACK_SIZE, stdin);
        vstup[strcspn(vstup, "\n")] = 0;
        if(strlen(vstup) == 0){
            break;
        }
        if(vstup[0] == '-' || vstup[0] == '+' || vstup[0] == '*' || vstup[0] == '/'){
            if(vstup[0] == '-'){
                mystack.values[0] = mystack.values[0] - mystack.values[1];
                for(int i = 1; mystack.values[i] != 0;i++){
                    mystack.values[i] = mystack.values[i+1];
                    mystack.values[i+1] = 0;
                    counter--;
                }
            }
                if(vstup[0] == '/'){
                mystack.values[0] = mystack.values[0] / mystack.values[1];
                for(int i = 1; mystack.values[i] != 0;i++){
                    mystack.values[i] = mystack.values[i+1];
                    mystack.values[i+1] = 0;
                    counter--;
                }
            }
                if(vstup[0] == '*'){
                mystack.values[0] = mystack.values[0] * mystack.values[1];
                for(int i = 1; mystack.values[i] != 0;i++){
                    mystack.values[i] = mystack.values[i+1];
                    mystack.values[i+1] = 0;
                    counter--;
                }
            }
                if(vstup[0] == '+'){
                mystack.values[0] = mystack.values[0] + mystack.values[1];
                for(int i = 1; mystack.values[i] != 0;i++){
                    mystack.values[i] = mystack.values[i+1];
                    mystack.values[i+1] = 0;
                    counter--;
                }
                }
            }
        else{
            float cislo = strtof(vstup, NULL);
            mystack.values[counter] = cislo;
            counter++;
            
        }
        mystack.size = counter;
        for(int i =0; mystack.values[i] != 0;i++){
            printf("%.2f ", mystack.values[i]);
        }
        printf("\n");
    }
}