n,k=map(int,input().split())
M=1+(n-1)//2
if k<=M:
  print("YES")
else:
  print("NO") n,k=map(int,input().split()) n map(int,input().split()) map int input().split() ().split () input split k M=1+(n-1)//2 M 1+(n-1)//2 1 (n-1)//2 n-1 n 1 2 if k<=M:
  print("YES")
else:
  print("NO") k<=M k M 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 M=1+(n-1)//2 1+(n-1)//2 M
n,k=map(int,input().split())
M=1+(n-1)//2
if k<=M:
  print("YES")
else:
  print("NO")