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

#define velkost 10

struct zasobnik {
    float price;
};

int main() {
    struct zasobnik databaza[velkost];
    char input[100]= {0};
    float number = 0;
    int counter = 0;

    while(fgets(input, sizeof(input), stdin) && strcmp( input, "\n" ) != 0 ){
        number = strtof(input, NULL);
        databaza[counter].price = number;
        
        if(input[0] == '+'){
            printf("%.2f \n",databaza[counter-2].price);
            printf("%.2f %.2f \n",databaza[counter-2].price, databaza[counter-1].price);
            databaza[counter-2].price = databaza[counter-2].price + databaza[counter-1].price;
            printf("%.2f \n",databaza[counter-2].price);
        }
        if(input[0] == '-'){
            printf("%.2f \n",databaza[counter-2].price);
            printf("%.2f %.2f \n",databaza[counter-2].price, databaza[counter-1].price);
            databaza[counter-2].price = databaza[counter-2].price - databaza[counter-1].price;
            printf("%.2f \n",databaza[counter-2].price);
        }
        if(input[0] == '/'){
            if(databaza[counter-1].price == 0){
                printf("division by zero");
                return 0;
            }
            printf("%.2f \n",databaza[counter-2].price);
            printf("%.2f %.2f \n",databaza[counter-2].price, databaza[counter-1].price);
            databaza[counter-2].price = databaza[counter-2].price / databaza[counter-1].price;
            printf("%.2f \n",databaza[counter-2].price);
        }
        if(input[0] == '*'){
            printf("%.2f \n",databaza[counter-2].price);
            printf("%.2f %.2f \n",databaza[counter-2].price, databaza[counter-1].price);
            databaza[counter-2].price = databaza[counter-2].price * databaza[counter-1].price;
            printf("%.2f \n",databaza[counter-2].price);
        }
        counter++;
    }
    printf("no input\n");
}