N,K=map(int, input().split())
if N/2+0.5>=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+0.5>=K:
    print("YES")

else:
    print("NO") N/2+0.5>=K N/2+0.5 N/2 N 2 0.5 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 N/2+0.5>=K:
    print("YES")

else:
    print("NO")