import math
n, k = map(int, input().split())

if round(n / 2) >= k or (n == 1 and k == 1):
    print("YES")
else:
    print("NO") import math math n, k = map(int, input().split()) n map(int, input().split()) map int input().split() ().split () input split k if round(n / 2) >= k or (n == 1 and k == 1):
    print("YES")
else:
    print("NO") round(n / 2) >= k or (n == 1 and k == 1) round(n / 2) >= k round(n / 2) round n / 2 n 2 k n == 1 and k == 1 n == 1 n 1 k == 1 k 1 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
import math
n, k = map(int, input().split())

if round(n / 2) >= k or (n == 1 and k == 1):
    print("YES")
else:
    print("NO")
