N,M = map(int,input().split())
A = list(map(int,input().split()))
high = 10**9+1
low = 0
while high-low>1:
    mid = (high+low)//2
    d = 0
    flag = True
    for i in range(N):
        if A[i]>mid*M:
            d += A[i]-mid*M
        elif A[i]<mid*M:
            if d>=mid*M-A[i]:
                d -= mid*M-A[i]
            else:
                flag = False
                break
    if flag:
        low = mid
    else:
        high = mid
print(low)