#!/usr/bin/env python
# -*- coding: utf-8 -*-

N,M = map(int,input().split())
C = sorted(list(map(int,input().split())))

i = 0
while M >= 0:
    M -= 1
    while C[i] == 0:
        i+= 1
        if i >= N:
            N = 0
    C[i] -= 1

print(sum([1 if C[i] <= 0 else 0 for i in range(N)]))