import java.util.ArrayList;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        try (Scanner scan = new Scanner(System.in)) {
            int N = scan.nextInt();
            ArrayList<Integer> list = new ArrayList<>();
            ArrayList<Integer> ansList = new ArrayList<>();
            int sum = 0;
            for(int i=0; i<N; i++) {
                list.add(scan.nextInt());
                sum += list.get(i);
            }
            
            int sqrtSum = (int)Math.sqrt(sum);
            sum = sqrtSum * sqrtSum;
            
            int mid = sum/2;
            int value = 1;
            while(sum > 0) {
                ansList.add(value);
                sum -= value;
                if(sum < mid) {
                    value--;
                } else {
                    value++;
                }
            }
            
            if(list.size() > ansList.size()) {
                int num = list.size() - ansList.size();
                for(int i=0; i<num; i++) {
                    ansList.add(0);
                }
            
            } else if(list.size() < ansList.size()) {
                int num = ansList.size() - list.size();
                for(int i=0; i<num; i++) {
                    list.add(0);
                }
            }
            
            int ans = 0;
            for(int i=0; i<list.size(); i++) {
                int diff = list.get(i) - ansList.get(i);
                if(diff > 0) {
                    ans += diff;
                }
            }
            System.out.println(ans);
        }
    }
}