Kolikot

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

public class Kolikot {

    public static void main(String[] args) {
        Scanner lukija = new Scanner(System.in);
        int kolikkomaara;
        HashMap<Integer, Integer> kolikoidenMaarat = new HashMap<>();

        kolikkomaara = Integer.parseInt(lukija.nextLine());
        int kolikko;

        for (int i = 1; i <= kolikkomaara; i++) {
            if (lukija.hasNext()) {
                kolikko = Integer.parseInt(lukija.next());
                if (!kolikoidenMaarat.containsKey(kolikko)) {
                    kolikoidenMaarat.put(kolikko, 1);
                } else {
                    kolikoidenMaarat.put(kolikko, kolikoidenMaarat.get(kolikko) + 1);
                }
            }
        }
        lukija.nextLine();

        long pienin = haePieninEiMuodostettavaArvo(kolikoidenMaarat);
        System.out.println(pienin);
    }

    private static long haePieninEiMuodostettavaArvo(HashMap<Integer, Integer> kolikoidenmaarat) {

        long pienin = 0;
        long testattava = 1;
        long summakertyma = 0;

        while (pienin == 0) {

            if (testattava > 1000000001) {
                return summakertyma + 1;
            }

            if (kolikoidenmaarat.containsKey((int) testattava - 1)) {
                int maara = kolikoidenmaarat.get((int) testattava - 1);
                long lisattava = testattava - 1;
                summakertyma += (maara * lisattava);
            }
            if ((summakertyma < testattava) && (!kolikoidenmaarat.containsKey((int) testattava))) {
                pienin = testattava;
            }
            testattava++;
        }
        return pienin;
    }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 16

Group: 3

Verdict: TIME LIMIT EXCEEDED