import java.util.*;

public class Solution {
    private List<Integer> list = new ArrayList<>();

    void addL(Integer a){


        list.add(a);

    }
    int solution()
    {

        Collections.sort(list);
        int min = list.get(0);

            for(int i=0;i<list.size()-1;i++) {
                if (list.get(i+1) - list.get(i) >=2 )
                {
                    min = list.get(i)+1;

                    break;
                }

                   if( list.get(list.size()-1) < 1)
                   {
                    min = 1;
                }
            }

        System.out.println(list);
        System.out.println(min);

        return 0;
    }
}