import java.util.Scanner;


public class GemiddeldeNeerslag {

    public static void main(String[] args) {
        System.out.println(new GemiddeldeNeerslag().calculateAverage());
    }

    private int[] neerslagarray = new int[12];

    public double calculateAverage() {
        int totaal = 0;
        for(int neerslag: neerslagarray) {
            totaal += neerslag;
        }
        return (double)(totaal)/12;
    }

    public GemiddeldeNeerslag() {
        Scanner scanner = new Scanner(System.in);
        for(int i = 0; i < 12; i++) {
            System.out.println("Geef de neerslag in voor maand " + (i + 1) + ":");
            int neerslag = scanner.nextInt();
            if(neerslag < 0)
                i--;
            else
                neerslagarray[i] = neerslag;
        }
        scanner.close();
    }
}


import java.util.Scanner;


public class CamelCase {

    public static void main(String[] args) {
        new CamelCase();
    }

    public CamelCase() {
        Scanner scanner = new Scanner(System.in);
        String input;
        System.out.println("Geef invoer");
        while(!(input = scanner.next()).equals("STOP")) {
            if(isUppercase(input.charAt(0))) {
                System.out.println("Hoofdletter");
            } else {
                System.out.println("Kleine letter");
            }
        }
        scanner.close();
    }

    private static boolean isUppercase(char ch) {
        return (ch <= 'Z' && ch >= 'A');
    }
}


import java.util.HashMap;
import java.util.Scanner;


public class KleurCode {

    public static HashMap<Character,Integer> map = new HashMap<Character,Integer>();

    public static void loadConstants() {
        map.put('z',0);
        map.put('b',1);
        map.put('r',2);
        map.put('o',3);
        map.put('g',4);
        map.put('G',5);
        map.put('B',6);
        map.put('V',7);
        map.put('L',8);
        map.put('W',9);
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        loadConstants();
        Scanner scanner = new Scanner(System.in);
        String input;
        System.out.println("Geef invoer plz");
        while((input = scanner.next()).length() != 3 || invalidCode(input)) {
            System.out.println("Maak dat invoer 3 karakters lang is plz, geef opnieuw in plz");
        }
        scanner.close();
        System.out.println(new KleurCode(input.toCharArray()).getResistance());
    }

    public static boolean invalidCode(String s) {
        for(char ch: s.toCharArray()) {
            if(map.get(ch) == null)
                return true;
        }
        return false;
    }

    public KleurCode(char[] values) {
        this.a = map.get(values[0]);
        this.b = map.get(values[1]);
        this.c = map.get(values[2]);
    }

    public KleurCode(int a, int b, int c) {
        this.a = a;
        this.b = b;
        this.c = c;
    }

    public KleurCode(int[] values) {
        a = values[0];
        b = values[1];
        c = values[2];
    }

    private int a;
    private int b;
    private int c;

    public int getResistance() {
        return (a * 10 + b) * (int)Math.pow(10, c);
    }

}


import java.util.Scanner;


public class Punten {

    public static final int SIZE = 20;

    public static void main(String[] args) {
        Punten punten = new Punten();
        punten.printInfo();
    }

    public void printInfo() {
        System.out.println("A's " + a + " B's " + b + " C's " + c + " Min :" + min + " Max: " + max);
    }

    private int a = 0;
    private int b = 0;
    private int c = 0;

    private int max = Integer.MIN_VALUE;
    private int min = Integer.MAX_VALUE;

    public Punten() {
        Scanner scanner = new Scanner(System.in);
        for(int i = 0; i < punten.length; i++) {
            int resultaat = scanner.nextInt();
            if(resultaat < 0) {
                i--;
                continue;
            }
            if(resultaat >= 12)
                a++;
            else if(resultaat >= 10)
                b++;
            else
                c++;
            if(resultaat > max)
                max = resultaat;
            else if(resultaat < min)
                min = resultaat;
            punten[i] = resultaat;
        }
        scanner.close();
    }

    private int[] punten = new int[SIZE];
}