04.Grandpa Stavri

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    int days;
    cin >> days;
    double total_liters = 0;
    double total_degrees = 0;

    for (int i = 0; i < days; ++i)
    {
        double liters;
        double degrees;
        cin >> liters >> degrees;

        total_liters = total_liters + liters;
        total_degrees = total_degrees + liters * degrees;
    }

    double degrees_all_alcohol = total_degrees / total_liters;

    cout << "Liter: " << fixed << setprecision(2) << total_liters << endl;
    cout << "Degrees: " << fixed << setprecision(2) << degrees_all_alcohol << endl;

    if (degrees_all_alcohol < 38)
    {
        cout << "Not good, you should baking!" << endl;
    }
    else if (degrees_all_alcohol >= 38 && degrees_all_alcohol <= 42)
    {
        cout << "Super!" << endl;
    }
    else
    {
        cout << "Dilution with distilled water!" << endl;
    }
    return 0;
}