Merenja Alternative Solution

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

class Merenja{

    double sum;
    int counter;

    public Merenja(double n){
        sum=n;
        counter=1;
    }


}

public class Main {

    public static void main(String[] args) {


        Scanner in = new Scanner(System.in);

        int brMerenja = Integer.parseInt(in.nextLine());


        HashMap<String, Merenja> hashMap = new HashMap<>();

        for (int i=0;i<brMerenja;i++){

            String [] niza = in.nextLine().split(" ");
            String opstina = niza[0];
            double temperatura = Double.parseDouble(niza[1].replace(',','.'));


            if (hashMap.containsKey(opstina)){
                hashMap.get(opstina).counter++;
                hashMap.get(opstina).sum+=temperatura;
            }

            else {

                hashMap.put(opstina, new Merenja(temperatura));
            }


        }

        String grad = in.next();

        System.out.println(hashMap.get(grad).sum/hashMap.get(grad).counter);


    }
}

/*
5
        Karposh 5,2
        Chair 3,11
        Centar 2,23
        Karposh 1,7
        Karposh 2,67
        Karposh
        3.19*/