n,m=map(int,input().split())
a=list(map(int,input().strip().split()))
for i in range(n-1):
    for j in range(i+1,n):
        if a[j]<a[i]:
            a[j],a[i]=a[i],a[j]
l=a[0];r=a[n-1]
def check(x):
    ans=0
    for i in range(n):
        if a[i]>x:
            ans+=a[i]-x
    if ans>=m:
        return True
    else:
        return False
while l<=r:
    mid=(l+r)//2
    if check(mid)==True:
        l=mid+1
    else:
        r=mid-1
print(l-1)