N,M = map(int,input().split())

A = list(map(int,input().split()))

l = 0
r = max(A)+1

while r-l != 1:

    m = (l+r)//2

    now = 0
    flag = True

    for i in range(N):
        now += A[i]
        now -= M * m

        if now < 0:
            flag = False
            break

    if flag:
        l = m
    else:
        r = m

print (l)