Main.java

import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int m = sc.nextInt();
    int[] trees = new int[n];

    for (int i = 0; i < n; i++)
      trees[i] = sc.nextInt();

    for (int i = 0; i <= 2000000000; i++)
      if (m == cutMany(trees, n, i)) {
        System.out.println(i);
        break;
      }
  }

  static int cut(int tree, int height) {
    int diff = tree - height;
    if (diff >= 0)
      return diff;
    else
      return 0;
  }

  static int cutMany(int[] trees, int n, int height) {
    return Arrays.stream(trees)
                 .map((tree) -> cut(tree, height))
                 .sum();
  }
}