import itertools

n,m = map(int,input().split())
a = list(map(int,input().split()))
s = list(itertools.accumulate(a))

def func(k):
	t = m * k
	res = True
	for i in s:
		if(i < t):
			res = False
			break
		t += m * k
	return res

ok = 0
ng = 10**9+1
while(ng-ok > 1):
	k = (ok+ng)//2
	if(func(k)):
		ok = k
	else:
		ng = k
print(ok)