Дядо Ставри

import java.util.Scanner;

public class demo {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int days = Integer.parseInt(scanner.nextLine());

        double litresSum = 0;
        double degreesSum = 0;

        for (int i = 0; i < days; i++) {
            double currentLitres = Double.parseDouble(scanner.nextLine());
            double currentDegrees = Double.parseDouble(scanner.nextLine());

            litresSum += currentLitres;
            degreesSum += currentLitres * currentDegrees;
        }

        double finalDegrees = degreesSum / litresSum;

        System.out.printf("Liter: %.2f%n", litresSum);
        System.out.printf("Degrees: %.2f%n", finalDegrees);

        if(finalDegrees < 38){
            System.out.printf("Not good, you should baking!");
        }else if(finalDegrees >= 38 && finalDegrees <= 42){
            System.out.printf("Super!");
        }else{
            System.out.printf("Dilution with distilled water!");
        }
    }
}