import sys
input = sys.stdin.readline

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

if n >= (2*k - 1):
    print("YES")
else:
    print("NO") import sys sys input = sys.stdin.readline input sys.stdin.readline sys.stdin sys stdin readline n, k = map(int, input().split()) n map(int, input().split()) map int input().split() ().split () input split k if n >= (2*k - 1):
    print("YES")
else:
    print("NO") n >= (2*k - 1) n 2*k - 1 2*k 2 k 1 print("YES") print "YES" print("NO") print "NO" input = sys.stdin.readline sys.stdin.readline input n, k = map(int, input().split()) map(int, input().split()) n k = map(int, input().split()) map(int, input().split()) k
import sys
input = sys.stdin.readline

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

if n >= (2*k - 1):
    print("YES")
else:
    print("NO")