# coding: utf-8

from collections import Counter
import math

n,m = map(int, input().split(" "))
candys = list(map(int,input().split(" ")))

while m != 0:
    min_ = candys.pop(candys.index(min(candys)))
    min_ -= 1
    if min_ != 0:
        candys.append(min_)
    m -= 1
print(n - len(candys))