//HeartRateExceptHandling.java

import java.util.Scanner;

public class HeartRateExceptHandling
{
    public static void main(String[] args)
    {
        Scanner scnr = new Scanner(System.in);
        int userAge;
        int avgMaxHeartRate;

        try
        {
            userAge = scnr.nextInt();

            if (userAge < 0)
            {
                throw new Exception("Invalid age");
            }

            // Source: https://www.heart.org/en/healthy-living/fitness
            avgMaxHeartRate = 220 - userAge;

            System.out.println("Avg: " + avgMaxHeartRate);
        }
        catch (Exception excpt)
        {
            System.out.println("Error: " + excpt.getMessage());
        }
    }
}