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

c.sort()
i = 0
cnt = 0
while cnt < m: 
    if c[i] > 0:
        c[i] -= 1
        cnt += 1
    else:
        i += 1

ans = 0
for ci in c:
    if ci == 0:
        ans += 1
print(ans)