n, k = map(int, input().split())
if n%2 == 0:
    if n//2 >= k:
        print('YES')
    else:
        print('NO')
else:
    if n//2+1 >= 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 n%2 == 0:
    if n//2 >= k:
        print('YES')
    else:
        print('NO')
else:
    if n//2+1 >= k:
        print('YES')
    else:
        print('NO') n%2 == 0 n%2 n 2 0 if n//2 >= k:
        print('YES')
    else:
        print('NO') n//2 >= k n//2 n 2 k print('YES') print 'YES' print('NO') print 'NO' if n//2+1 >= k:
        print('YES')
    else:
        print('NO') n//2+1 >= k n//2+1 n//2 n 2 1 k 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 == 0:
    if n//2 >= k:
        print('YES')
    else:
        print('NO')
else:
    if n//2+1 >= k:
        print('YES')
    else:
        print('NO')
