N ,K = map(int,input().split())
A = list(map(int, input().split()))
A.sort()

num_list = [0]
i = 0
j = 0
while j < N:
    if A[j] == i:
        num_list[i] += 1
        j += 1
    else:
        num_list.append(0)
        i += 1

max_num = max(num_list[1:]) if len(num_list) > 1 else 0

if max_num + num_list[0] >= K:
    print('Yes')
else:
    print('No')