#include <stdio.h>
#include <stdlib.h>
double calculate(char op, double num1, double num2) {
    double result = 0;
    switch (op) {
        case '+':
            result = num1 + num2;
            break;
        case '-':
            result = num1 - num2;
            break;
        case '*':
            result = num1 * num2;
            break;
        case '/':
            result = num1 / num2;
            break;
    }
    return result;
}
int main() {
    double number = 0;
    double tmpNumber = 0;
    char input;
    char operator;
    while (1) {
        scanf(" %c", &input);
        switch (input) {
            case '+':
                operator = '+';
                tmpNumber = number;
                number = 0;
                break;
            case '-':
                operator = '-';
                tmpNumber = number;
                number = 0;
                break;
            case '*':
                operator = '*';
                tmpNumber = number;
                number = 0;
                break;
            case '/':
                operator = '/';
                tmpNumber = number;
                number = 0;
                break;
            case '=':
                printf("%lf\n", calculate(operator, tmpNumber, number));
                tmpNumber = 0;
                number = 0;
                break;
            case 'q':
                goto exit;
                // operator doesn't match any case constant
            default:
                number = (number * 10) + atof(&input);
                printf("%.1lf\n", number);
        }
    }
    exit:
    return 0;
}