n,k = map(int,input().split())
if int((n+1)/2) >= k:
    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 int((n+1)/2) >= k:
    print('YES')
else:
    print('NO') int((n+1)/2) >= k int((n+1)/2) int (n+1)/2 n+1 n 1 2 k print('YES') print 'YES' print('NO') print 'NO' n,k = map(int,input().split()) map(int,input().split()) n k = map(int,input().split()) map(int,input().split()) k
n,k = map(int,input().split())
if int((n+1)/2) >= k:
    print('YES')
else:
    print('NO')