import java.util.*;
public class Main {
	static int[][] map;
	static int[][] ans;
	static int[] vx = new int[] {1,0,-1,0};
	static int[] vy = new int[] {0,1,0,-1};
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		
		int[] list = new int[n];
		for(int i = 0; i < n; i++) {
			list[i] = sc.nextInt();
		}
		Arrays.sort(list);
		int count = 0;
		for(int i = 0; i < m; i++) {
			list[count]--;
			while(list[count] == 0) {
				count++;
			}
		}
		System.out.println(count);
	}
}