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

if N >= 2*(K-1)+1:
    print('YES')
else:
    print("NO") N, K = map(int, input().split()) N map(int, input().split()) map int input().split() ().split () input split K if N >= 2*(K-1)+1:
    print('YES')
else:
    print("NO") N >= 2*(K-1)+1 N 2*(K-1)+1 2*(K-1) 2 K-1 K 1 1 print('YES') print 'YES' print("NO") print "NO" K = map(int, input().split()) map(int, input().split()) K N, K = map(int, input().split()) map(int, input().split()) N
N, K = map(int, input().split())

if N >= 2*(K-1)+1:
    print('YES')
else:
    print("NO")