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

def is_ok(x):
    y = 0
    for a in A:
        y += a-m*x
        if y < 0:
            return False
    return True

ok = 0
ng = 10**9+50
while ok +1 < ng:
    c = (ok+ng)//2
    if is_ok(c):
        ok = c
    else:
        ng = c
print(ok)