import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        try (Scanner scan = new Scanner(System.in)) {
            int N = scan.nextInt();
            int list[] = new int[101];
            int ansList[] = new int[101];
            int sum = 0;
            for(int i=0; i<N; i++) {
                list[i] = scan.nextInt();
                sum += list[i];
            }
            
            int sqrtSum = (int)Math.sqrt(sum);
            sum = sqrtSum * sqrtSum;
            
            int mid = sum/2;
            int index = 0;
            int value = 1;
            while(sum > 0) {
                ansList[index] = value;
                sum -= value;
                if(sum < mid) {
                    value--;
                } else {
                    value++;
                }
                index++;
            }
            
            int ans = 0;
            for(int i=0; i<101; i++) {
                int diff = list[i] - ansList[i];
                if(diff > 0) {
                    ans += diff;
                }
            }
            System.out.println(ans);
        }
    }
}