#include <stdio.h>

int main(void)
{
    int totalNumOfTemp = 0;
    double maxTemp = 0, minTemp = 0, sumTotal = 0, weeklySumTemp = 0, userInput;

    while (scanf("%lf", &userInput) > 0)
    {
        // checking for new min/max temps
        if (userInput < minTemp || minTemp == 0)
        {
            minTemp = userInput;
        }

        if (userInput > maxTemp)
        {
            maxTemp = userInput;
        }

        sumTotal += userInput;
        weeklySumTemp += userInput;
        totalNumOfTemp++;

        if (totalNumOfTemp % 7 == 0)
        {
            const int weekNumber = totalNumOfTemp / 7;

            printf("Week %d average: %.2lf\n", weekNumber, (weeklySumTemp / 7));

            weeklySumTemp = 0;
        }
    }

    // printing the final points of information
    printf("Max temp: %.2lf\n", maxTemp);
    printf("Min temp: %.2lf\n", minTemp);

    double avgTemp = sumTotal / totalNumOfTemp;
    if (avgTemp < 15)
    {
        printf("Error in input!\n");
    }
    else
    {
        printf("Average temp: %.2lf\n", avgTemp);
    }

    return 0;
}